What is the meaning of the following statement about subsequences? [on hold]

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Sum of subsequence * GCD of subsequence over all K length subsequence of a given array.



array=[1,2] K=1 
answer = 5


How the answer is 5?




contest-math




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put on hold as off-topic by amWhy, Taroccoesbrocco, Arnaud Mortier, José Carlos Santos, Simply Beautiful Art 11 hours ago


This question appears to be off-topic. The users who voted to close gave this specific reason:


  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – amWhy, Taroccoesbrocco, Arnaud Mortier, José Carlos Santos
If this question can be reworded to fit the rules in the help center, please edit the question.












  • Subsequences of size $1$: $(1)$, and $(2)$. Corresponding GCDs: well, $1$ and $2$. From there, $1cdot 1+2cdot 2 = 5$.
    – Clement C.
    16 hours ago






  • 4




    If the contest is ongoing you should link to it. Site policy prohibits questions from ongoing contests (though simple clarification, as here, should be ok).
    – lulu
    16 hours ago










  • Yeah! I was looking only for some clarification.
    – Anonymous
    15 hours ago














up vote
-5
down vote

favorite












Sum of subsequence * GCD of subsequence over all K length subsequence of a given array.



array=[1,2] K=1 
answer = 5


How the answer is 5?




contest-math




share|cite|improve this question













put on hold as off-topic by amWhy, Taroccoesbrocco, Arnaud Mortier, José Carlos Santos, Simply Beautiful Art 11 hours ago


This question appears to be off-topic. The users who voted to close gave this specific reason:


  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – amWhy, Taroccoesbrocco, Arnaud Mortier, José Carlos Santos
If this question can be reworded to fit the rules in the help center, please edit the question.












  • Subsequences of size $1$: $(1)$, and $(2)$. Corresponding GCDs: well, $1$ and $2$. From there, $1cdot 1+2cdot 2 = 5$.
    – Clement C.
    16 hours ago






  • 4




    If the contest is ongoing you should link to it. Site policy prohibits questions from ongoing contests (though simple clarification, as here, should be ok).
    – lulu
    16 hours ago










  • Yeah! I was looking only for some clarification.
    – Anonymous
    15 hours ago












up vote
-5
down vote

favorite









up vote
-5
down vote

favorite











Sum of subsequence * GCD of subsequence over all K length subsequence of a given array.



array=[1,2] K=1 
answer = 5


How the answer is 5?




contest-math




share|cite|improve this question













Sum of subsequence * GCD of subsequence over all K length subsequence of a given array.



array=[1,2] K=1 
answer = 5


How the answer is 5?





contest-math





share|cite|improve this question












share|cite|improve this question




share|cite|improve this question








edited 16 hours ago









Clement C.

46.8k33581




46.8k33581









asked 16 hours ago









Anonymous

1




1




put on hold as off-topic by amWhy, Taroccoesbrocco, Arnaud Mortier, José Carlos Santos, Simply Beautiful Art 11 hours ago


This question appears to be off-topic. The users who voted to close gave this specific reason:


  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – amWhy, Taroccoesbrocco, Arnaud Mortier, José Carlos Santos
If this question can be reworded to fit the rules in the help center, please edit the question.




put on hold as off-topic by amWhy, Taroccoesbrocco, Arnaud Mortier, José Carlos Santos, Simply Beautiful Art 11 hours ago


This question appears to be off-topic. The users who voted to close gave this specific reason:


  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – amWhy, Taroccoesbrocco, Arnaud Mortier, José Carlos Santos
If this question can be reworded to fit the rules in the help center, please edit the question.











  • Subsequences of size $1$: $(1)$, and $(2)$. Corresponding GCDs: well, $1$ and $2$. From there, $1cdot 1+2cdot 2 = 5$.
    – Clement C.
    16 hours ago






  • 4




    If the contest is ongoing you should link to it. Site policy prohibits questions from ongoing contests (though simple clarification, as here, should be ok).
    – lulu
    16 hours ago










  • Yeah! I was looking only for some clarification.
    – Anonymous
    15 hours ago
















  • Subsequences of size $1$: $(1)$, and $(2)$. Corresponding GCDs: well, $1$ and $2$. From there, $1cdot 1+2cdot 2 = 5$.
    – Clement C.
    16 hours ago






  • 4




    If the contest is ongoing you should link to it. Site policy prohibits questions from ongoing contests (though simple clarification, as here, should be ok).
    – lulu
    16 hours ago










  • Yeah! I was looking only for some clarification.
    – Anonymous
    15 hours ago















Subsequences of size $1$: $(1)$, and $(2)$. Corresponding GCDs: well, $1$ and $2$. From there, $1cdot 1+2cdot 2 = 5$.
– Clement C.
16 hours ago




Subsequences of size $1$: $(1)$, and $(2)$. Corresponding GCDs: well, $1$ and $2$. From there, $1cdot 1+2cdot 2 = 5$.
– Clement C.
16 hours ago




4




4




If the contest is ongoing you should link to it. Site policy prohibits questions from ongoing contests (though simple clarification, as here, should be ok).
– lulu
16 hours ago




If the contest is ongoing you should link to it. Site policy prohibits questions from ongoing contests (though simple clarification, as here, should be ok).
– lulu
16 hours ago












Yeah! I was looking only for some clarification.
– Anonymous
15 hours ago




Yeah! I was looking only for some clarification.
– Anonymous
15 hours ago















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