Find the sum of the First $50$ Natural Numbers starting from $11$. Is it from $11-50$ or $11-60$?

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This a simple question yet confusing for me, I found the answer as 1220 by taking sum from $11$ to $50$, by inferring the question as first 50 natural numbers $1,2,3,4,5,6,7,8,9,10,11,...49,50$



and sum starting from 11 which means sum $= 11+12+...+49+50$.
But my friend says otherwise, he took from 11 to 60 and says answer as 1775. Can anyone explain how to infer the word first in the context of maths.







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  • 1




    Welcome to MSE. For some basic information about writing mathematics at this site see, e.g., basic help on mathjax notation, mathjax tutorial and quick reference, main meta site math tutorial and equation editing how-to.
    – José Carlos Santos
    Aug 6 at 18:57










  • I've fixed the title to something more relevant.
    – Jam
    Aug 6 at 19:41










  • Pls revert it back or add "find the sum of" to the start.. see the comment from me which has an image snapshot of the exact question, if you change the title into this it will change the meaning of what i am trying to ask in the description.
    – Subhassh Mahenthren
    Aug 6 at 19:49











  • @SubhasshMahenthren Done. I was slightly reluctant to include it since I think people were glancing at the "sum of" and not actually focusing on what your question was really regarding.
    – Jam
    Aug 6 at 20:01










  • @Jam Oops sry i changed it before i saw your comment. change it whichever way you feel is better or leave if its ok as of now..
    – Subhassh Mahenthren
    Aug 6 at 20:07















up vote
2
down vote

favorite












This a simple question yet confusing for me, I found the answer as 1220 by taking sum from $11$ to $50$, by inferring the question as first 50 natural numbers $1,2,3,4,5,6,7,8,9,10,11,...49,50$



and sum starting from 11 which means sum $= 11+12+...+49+50$.
But my friend says otherwise, he took from 11 to 60 and says answer as 1775. Can anyone explain how to infer the word first in the context of maths.







share|cite|improve this question

















  • 1




    Welcome to MSE. For some basic information about writing mathematics at this site see, e.g., basic help on mathjax notation, mathjax tutorial and quick reference, main meta site math tutorial and equation editing how-to.
    – José Carlos Santos
    Aug 6 at 18:57










  • I've fixed the title to something more relevant.
    – Jam
    Aug 6 at 19:41










  • Pls revert it back or add "find the sum of" to the start.. see the comment from me which has an image snapshot of the exact question, if you change the title into this it will change the meaning of what i am trying to ask in the description.
    – Subhassh Mahenthren
    Aug 6 at 19:49











  • @SubhasshMahenthren Done. I was slightly reluctant to include it since I think people were glancing at the "sum of" and not actually focusing on what your question was really regarding.
    – Jam
    Aug 6 at 20:01










  • @Jam Oops sry i changed it before i saw your comment. change it whichever way you feel is better or leave if its ok as of now..
    – Subhassh Mahenthren
    Aug 6 at 20:07













up vote
2
down vote

favorite









up vote
2
down vote

favorite











This a simple question yet confusing for me, I found the answer as 1220 by taking sum from $11$ to $50$, by inferring the question as first 50 natural numbers $1,2,3,4,5,6,7,8,9,10,11,...49,50$



and sum starting from 11 which means sum $= 11+12+...+49+50$.
But my friend says otherwise, he took from 11 to 60 and says answer as 1775. Can anyone explain how to infer the word first in the context of maths.







share|cite|improve this question













This a simple question yet confusing for me, I found the answer as 1220 by taking sum from $11$ to $50$, by inferring the question as first 50 natural numbers $1,2,3,4,5,6,7,8,9,10,11,...49,50$



and sum starting from 11 which means sum $= 11+12+...+49+50$.
But my friend says otherwise, he took from 11 to 60 and says answer as 1775. Can anyone explain how to infer the word first in the context of maths.









share|cite|improve this question












share|cite|improve this question




share|cite|improve this question








edited Aug 6 at 20:26
























asked Aug 6 at 18:50









Subhassh Mahenthren

113




113







  • 1




    Welcome to MSE. For some basic information about writing mathematics at this site see, e.g., basic help on mathjax notation, mathjax tutorial and quick reference, main meta site math tutorial and equation editing how-to.
    – José Carlos Santos
    Aug 6 at 18:57










  • I've fixed the title to something more relevant.
    – Jam
    Aug 6 at 19:41










  • Pls revert it back or add "find the sum of" to the start.. see the comment from me which has an image snapshot of the exact question, if you change the title into this it will change the meaning of what i am trying to ask in the description.
    – Subhassh Mahenthren
    Aug 6 at 19:49











  • @SubhasshMahenthren Done. I was slightly reluctant to include it since I think people were glancing at the "sum of" and not actually focusing on what your question was really regarding.
    – Jam
    Aug 6 at 20:01










  • @Jam Oops sry i changed it before i saw your comment. change it whichever way you feel is better or leave if its ok as of now..
    – Subhassh Mahenthren
    Aug 6 at 20:07













  • 1




    Welcome to MSE. For some basic information about writing mathematics at this site see, e.g., basic help on mathjax notation, mathjax tutorial and quick reference, main meta site math tutorial and equation editing how-to.
    – José Carlos Santos
    Aug 6 at 18:57










  • I've fixed the title to something more relevant.
    – Jam
    Aug 6 at 19:41










  • Pls revert it back or add "find the sum of" to the start.. see the comment from me which has an image snapshot of the exact question, if you change the title into this it will change the meaning of what i am trying to ask in the description.
    – Subhassh Mahenthren
    Aug 6 at 19:49











  • @SubhasshMahenthren Done. I was slightly reluctant to include it since I think people were glancing at the "sum of" and not actually focusing on what your question was really regarding.
    – Jam
    Aug 6 at 20:01










  • @Jam Oops sry i changed it before i saw your comment. change it whichever way you feel is better or leave if its ok as of now..
    – Subhassh Mahenthren
    Aug 6 at 20:07








1




1




Welcome to MSE. For some basic information about writing mathematics at this site see, e.g., basic help on mathjax notation, mathjax tutorial and quick reference, main meta site math tutorial and equation editing how-to.
– José Carlos Santos
Aug 6 at 18:57




Welcome to MSE. For some basic information about writing mathematics at this site see, e.g., basic help on mathjax notation, mathjax tutorial and quick reference, main meta site math tutorial and equation editing how-to.
– José Carlos Santos
Aug 6 at 18:57












I've fixed the title to something more relevant.
– Jam
Aug 6 at 19:41




I've fixed the title to something more relevant.
– Jam
Aug 6 at 19:41












Pls revert it back or add "find the sum of" to the start.. see the comment from me which has an image snapshot of the exact question, if you change the title into this it will change the meaning of what i am trying to ask in the description.
– Subhassh Mahenthren
Aug 6 at 19:49





Pls revert it back or add "find the sum of" to the start.. see the comment from me which has an image snapshot of the exact question, if you change the title into this it will change the meaning of what i am trying to ask in the description.
– Subhassh Mahenthren
Aug 6 at 19:49













@SubhasshMahenthren Done. I was slightly reluctant to include it since I think people were glancing at the "sum of" and not actually focusing on what your question was really regarding.
– Jam
Aug 6 at 20:01




@SubhasshMahenthren Done. I was slightly reluctant to include it since I think people were glancing at the "sum of" and not actually focusing on what your question was really regarding.
– Jam
Aug 6 at 20:01












@Jam Oops sry i changed it before i saw your comment. change it whichever way you feel is better or leave if its ok as of now..
– Subhassh Mahenthren
Aug 6 at 20:07





@Jam Oops sry i changed it before i saw your comment. change it whichever way you feel is better or leave if its ok as of now..
– Subhassh Mahenthren
Aug 6 at 20:07











4 Answers
4






active

oldest

votes

















up vote
3
down vote













I think there's a bit of ambiguity in the language, so either interpretation is justified. I also think it's just a poorly worded question. The only recourse is to ask whoever set the question or to just let it go - I don't think the intended meaning is really something you can figure out by yourself.



To clarify why I believe both interpretations are valid:



  1. "The first $50$ natural numbers" means $1-50$. So then "The first $50$ natural numbers (starting from $11$)" could mean the same set $1-50$ but starting from $11$ and excluding $1-10$. So $11-50$.


  2. "The natural numbers starting from $11$" means $11,12,ldots$. So then "(The first $50$) natural numbers starting from $11$" could mean the first $50$ elements of this set. So $11-60$.






share|cite|improve this answer






























    up vote
    0
    down vote













    From a book for GRE practice



    I can see how the word "first" is used in a particular context in mathematics. Is that why my interpretation is wrong... or is that my interpretation does not bring logic even by english, that's what i would like to know.. thanks @jam now i know i am not alone in this.
    Take a look at the image link attached here, if we see the options everyone will surely come to conclusion my friend is right.. but i wanted to clarify if there is any logical mistake in my interpretation.






    share|cite|improve this answer






























      up vote
      0
      down vote













      Following the link that you provided, we find that the wording in the review book is




      Find the sum of first $50$ natural numbers starting from $11$.




      This is not Standard English; it should say "of the first" rather than "of first". Hence I have some doubts that you will ever see a question worded exactly like this on an actual GRE exam.



      But if the phrase "the first $50$ natural numbers starting from $11$" were to occur on an actual GRE, I probably would interpret it by considering the
      "natural numbers starting from $11$" (which are $11, 12, 13, ldots$) and then taking the first $50$ of those.



      That is, I would take
      the first $50$ members of $n in mathbb N mid n geq 11.$



      The alternative, if I first collect the first $50$ natural numbers and then "[start] from $11$", is that the "starting from $11$" part becomes meaningless. I already have a finite set of $50$ numbers, so what does it matter any more where the set "starts"?
      If I write $11,12,13,ldots,49,50,1,2,3,ldots,9,10,$
      it means exactly the same thing as $1,2,3,ldots,49,50.$
      The "starting" point of the sum of a finite set is just as meaningless,
      since addition is commutative.



      This logic does not prove that my interpretation is correct--I believe the wording is ambiguous--but I find the other interpretation a highly unnatural use of the natural English language.






      share|cite|improve this answer





















      • Yes! "of the first" seems to makes some difference, thank you.
        – Subhassh Mahenthren
        Aug 7 at 12:24

















      up vote
      -2
      down vote













      There's a high school formula for the sum of consecutive terms in an arithmetic sequence: it is equal to the number of terms, times the arithmetic mean of the first and last term.



      Here the first term is $11$ and $50$th term is $60$, so the sum is
      $$50timesfrac11+602=1775.$$






      share|cite|improve this answer























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        4 Answers
        4






        active

        oldest

        votes








        4 Answers
        4






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes








        up vote
        3
        down vote













        I think there's a bit of ambiguity in the language, so either interpretation is justified. I also think it's just a poorly worded question. The only recourse is to ask whoever set the question or to just let it go - I don't think the intended meaning is really something you can figure out by yourself.



        To clarify why I believe both interpretations are valid:



        1. "The first $50$ natural numbers" means $1-50$. So then "The first $50$ natural numbers (starting from $11$)" could mean the same set $1-50$ but starting from $11$ and excluding $1-10$. So $11-50$.


        2. "The natural numbers starting from $11$" means $11,12,ldots$. So then "(The first $50$) natural numbers starting from $11$" could mean the first $50$ elements of this set. So $11-60$.






        share|cite|improve this answer



























          up vote
          3
          down vote













          I think there's a bit of ambiguity in the language, so either interpretation is justified. I also think it's just a poorly worded question. The only recourse is to ask whoever set the question or to just let it go - I don't think the intended meaning is really something you can figure out by yourself.



          To clarify why I believe both interpretations are valid:



          1. "The first $50$ natural numbers" means $1-50$. So then "The first $50$ natural numbers (starting from $11$)" could mean the same set $1-50$ but starting from $11$ and excluding $1-10$. So $11-50$.


          2. "The natural numbers starting from $11$" means $11,12,ldots$. So then "(The first $50$) natural numbers starting from $11$" could mean the first $50$ elements of this set. So $11-60$.






          share|cite|improve this answer

























            up vote
            3
            down vote










            up vote
            3
            down vote









            I think there's a bit of ambiguity in the language, so either interpretation is justified. I also think it's just a poorly worded question. The only recourse is to ask whoever set the question or to just let it go - I don't think the intended meaning is really something you can figure out by yourself.



            To clarify why I believe both interpretations are valid:



            1. "The first $50$ natural numbers" means $1-50$. So then "The first $50$ natural numbers (starting from $11$)" could mean the same set $1-50$ but starting from $11$ and excluding $1-10$. So $11-50$.


            2. "The natural numbers starting from $11$" means $11,12,ldots$. So then "(The first $50$) natural numbers starting from $11$" could mean the first $50$ elements of this set. So $11-60$.






            share|cite|improve this answer















            I think there's a bit of ambiguity in the language, so either interpretation is justified. I also think it's just a poorly worded question. The only recourse is to ask whoever set the question or to just let it go - I don't think the intended meaning is really something you can figure out by yourself.



            To clarify why I believe both interpretations are valid:



            1. "The first $50$ natural numbers" means $1-50$. So then "The first $50$ natural numbers (starting from $11$)" could mean the same set $1-50$ but starting from $11$ and excluding $1-10$. So $11-50$.


            2. "The natural numbers starting from $11$" means $11,12,ldots$. So then "(The first $50$) natural numbers starting from $11$" could mean the first $50$ elements of this set. So $11-60$.







            share|cite|improve this answer















            share|cite|improve this answer



            share|cite|improve this answer








            edited Aug 6 at 21:46


























            answered Aug 6 at 18:54









            Jam

            4,25611230




            4,25611230




















                up vote
                0
                down vote













                From a book for GRE practice



                I can see how the word "first" is used in a particular context in mathematics. Is that why my interpretation is wrong... or is that my interpretation does not bring logic even by english, that's what i would like to know.. thanks @jam now i know i am not alone in this.
                Take a look at the image link attached here, if we see the options everyone will surely come to conclusion my friend is right.. but i wanted to clarify if there is any logical mistake in my interpretation.






                share|cite|improve this answer



























                  up vote
                  0
                  down vote













                  From a book for GRE practice



                  I can see how the word "first" is used in a particular context in mathematics. Is that why my interpretation is wrong... or is that my interpretation does not bring logic even by english, that's what i would like to know.. thanks @jam now i know i am not alone in this.
                  Take a look at the image link attached here, if we see the options everyone will surely come to conclusion my friend is right.. but i wanted to clarify if there is any logical mistake in my interpretation.






                  share|cite|improve this answer

























                    up vote
                    0
                    down vote










                    up vote
                    0
                    down vote









                    From a book for GRE practice



                    I can see how the word "first" is used in a particular context in mathematics. Is that why my interpretation is wrong... or is that my interpretation does not bring logic even by english, that's what i would like to know.. thanks @jam now i know i am not alone in this.
                    Take a look at the image link attached here, if we see the options everyone will surely come to conclusion my friend is right.. but i wanted to clarify if there is any logical mistake in my interpretation.






                    share|cite|improve this answer















                    From a book for GRE practice



                    I can see how the word "first" is used in a particular context in mathematics. Is that why my interpretation is wrong... or is that my interpretation does not bring logic even by english, that's what i would like to know.. thanks @jam now i know i am not alone in this.
                    Take a look at the image link attached here, if we see the options everyone will surely come to conclusion my friend is right.. but i wanted to clarify if there is any logical mistake in my interpretation.







                    share|cite|improve this answer















                    share|cite|improve this answer



                    share|cite|improve this answer








                    edited Aug 6 at 19:43







                    user579082


















                    answered Aug 6 at 19:09









                    Subhassh Mahenthren

                    113




                    113




















                        up vote
                        0
                        down vote













                        Following the link that you provided, we find that the wording in the review book is




                        Find the sum of first $50$ natural numbers starting from $11$.




                        This is not Standard English; it should say "of the first" rather than "of first". Hence I have some doubts that you will ever see a question worded exactly like this on an actual GRE exam.



                        But if the phrase "the first $50$ natural numbers starting from $11$" were to occur on an actual GRE, I probably would interpret it by considering the
                        "natural numbers starting from $11$" (which are $11, 12, 13, ldots$) and then taking the first $50$ of those.



                        That is, I would take
                        the first $50$ members of $n in mathbb N mid n geq 11.$



                        The alternative, if I first collect the first $50$ natural numbers and then "[start] from $11$", is that the "starting from $11$" part becomes meaningless. I already have a finite set of $50$ numbers, so what does it matter any more where the set "starts"?
                        If I write $11,12,13,ldots,49,50,1,2,3,ldots,9,10,$
                        it means exactly the same thing as $1,2,3,ldots,49,50.$
                        The "starting" point of the sum of a finite set is just as meaningless,
                        since addition is commutative.



                        This logic does not prove that my interpretation is correct--I believe the wording is ambiguous--but I find the other interpretation a highly unnatural use of the natural English language.






                        share|cite|improve this answer





















                        • Yes! "of the first" seems to makes some difference, thank you.
                          – Subhassh Mahenthren
                          Aug 7 at 12:24














                        up vote
                        0
                        down vote













                        Following the link that you provided, we find that the wording in the review book is




                        Find the sum of first $50$ natural numbers starting from $11$.




                        This is not Standard English; it should say "of the first" rather than "of first". Hence I have some doubts that you will ever see a question worded exactly like this on an actual GRE exam.



                        But if the phrase "the first $50$ natural numbers starting from $11$" were to occur on an actual GRE, I probably would interpret it by considering the
                        "natural numbers starting from $11$" (which are $11, 12, 13, ldots$) and then taking the first $50$ of those.



                        That is, I would take
                        the first $50$ members of $n in mathbb N mid n geq 11.$



                        The alternative, if I first collect the first $50$ natural numbers and then "[start] from $11$", is that the "starting from $11$" part becomes meaningless. I already have a finite set of $50$ numbers, so what does it matter any more where the set "starts"?
                        If I write $11,12,13,ldots,49,50,1,2,3,ldots,9,10,$
                        it means exactly the same thing as $1,2,3,ldots,49,50.$
                        The "starting" point of the sum of a finite set is just as meaningless,
                        since addition is commutative.



                        This logic does not prove that my interpretation is correct--I believe the wording is ambiguous--but I find the other interpretation a highly unnatural use of the natural English language.






                        share|cite|improve this answer





















                        • Yes! "of the first" seems to makes some difference, thank you.
                          – Subhassh Mahenthren
                          Aug 7 at 12:24












                        up vote
                        0
                        down vote










                        up vote
                        0
                        down vote









                        Following the link that you provided, we find that the wording in the review book is




                        Find the sum of first $50$ natural numbers starting from $11$.




                        This is not Standard English; it should say "of the first" rather than "of first". Hence I have some doubts that you will ever see a question worded exactly like this on an actual GRE exam.



                        But if the phrase "the first $50$ natural numbers starting from $11$" were to occur on an actual GRE, I probably would interpret it by considering the
                        "natural numbers starting from $11$" (which are $11, 12, 13, ldots$) and then taking the first $50$ of those.



                        That is, I would take
                        the first $50$ members of $n in mathbb N mid n geq 11.$



                        The alternative, if I first collect the first $50$ natural numbers and then "[start] from $11$", is that the "starting from $11$" part becomes meaningless. I already have a finite set of $50$ numbers, so what does it matter any more where the set "starts"?
                        If I write $11,12,13,ldots,49,50,1,2,3,ldots,9,10,$
                        it means exactly the same thing as $1,2,3,ldots,49,50.$
                        The "starting" point of the sum of a finite set is just as meaningless,
                        since addition is commutative.



                        This logic does not prove that my interpretation is correct--I believe the wording is ambiguous--but I find the other interpretation a highly unnatural use of the natural English language.






                        share|cite|improve this answer













                        Following the link that you provided, we find that the wording in the review book is




                        Find the sum of first $50$ natural numbers starting from $11$.




                        This is not Standard English; it should say "of the first" rather than "of first". Hence I have some doubts that you will ever see a question worded exactly like this on an actual GRE exam.



                        But if the phrase "the first $50$ natural numbers starting from $11$" were to occur on an actual GRE, I probably would interpret it by considering the
                        "natural numbers starting from $11$" (which are $11, 12, 13, ldots$) and then taking the first $50$ of those.



                        That is, I would take
                        the first $50$ members of $n in mathbb N mid n geq 11.$



                        The alternative, if I first collect the first $50$ natural numbers and then "[start] from $11$", is that the "starting from $11$" part becomes meaningless. I already have a finite set of $50$ numbers, so what does it matter any more where the set "starts"?
                        If I write $11,12,13,ldots,49,50,1,2,3,ldots,9,10,$
                        it means exactly the same thing as $1,2,3,ldots,49,50.$
                        The "starting" point of the sum of a finite set is just as meaningless,
                        since addition is commutative.



                        This logic does not prove that my interpretation is correct--I believe the wording is ambiguous--but I find the other interpretation a highly unnatural use of the natural English language.







                        share|cite|improve this answer













                        share|cite|improve this answer



                        share|cite|improve this answer











                        answered Aug 6 at 20:47









                        David K

                        48.3k340107




                        48.3k340107











                        • Yes! "of the first" seems to makes some difference, thank you.
                          – Subhassh Mahenthren
                          Aug 7 at 12:24
















                        • Yes! "of the first" seems to makes some difference, thank you.
                          – Subhassh Mahenthren
                          Aug 7 at 12:24















                        Yes! "of the first" seems to makes some difference, thank you.
                        – Subhassh Mahenthren
                        Aug 7 at 12:24




                        Yes! "of the first" seems to makes some difference, thank you.
                        – Subhassh Mahenthren
                        Aug 7 at 12:24










                        up vote
                        -2
                        down vote













                        There's a high school formula for the sum of consecutive terms in an arithmetic sequence: it is equal to the number of terms, times the arithmetic mean of the first and last term.



                        Here the first term is $11$ and $50$th term is $60$, so the sum is
                        $$50timesfrac11+602=1775.$$






                        share|cite|improve this answer



























                          up vote
                          -2
                          down vote













                          There's a high school formula for the sum of consecutive terms in an arithmetic sequence: it is equal to the number of terms, times the arithmetic mean of the first and last term.



                          Here the first term is $11$ and $50$th term is $60$, so the sum is
                          $$50timesfrac11+602=1775.$$






                          share|cite|improve this answer

























                            up vote
                            -2
                            down vote










                            up vote
                            -2
                            down vote









                            There's a high school formula for the sum of consecutive terms in an arithmetic sequence: it is equal to the number of terms, times the arithmetic mean of the first and last term.



                            Here the first term is $11$ and $50$th term is $60$, so the sum is
                            $$50timesfrac11+602=1775.$$






                            share|cite|improve this answer















                            There's a high school formula for the sum of consecutive terms in an arithmetic sequence: it is equal to the number of terms, times the arithmetic mean of the first and last term.



                            Here the first term is $11$ and $50$th term is $60$, so the sum is
                            $$50timesfrac11+602=1775.$$







                            share|cite|improve this answer















                            share|cite|improve this answer



                            share|cite|improve this answer








                            edited Aug 6 at 21:21


























                            answered Aug 6 at 19:02









                            Bernard

                            110k635103




                            110k635103






















                                 

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