- #1
Josie Jones
- 3
- 0
Hi, I am trying to simplify a double summation and was wondering if anyone would be able to help me.
The sum is
$$ \sum_{i=1}^{n-1} \sum_{j=i+1}^n a_i a_j $$
Is it possible to simplify it down and maybe lose one of the sigmas?
Thank you in advance :)
The sum is
$$ \sum_{i=1}^{n-1} \sum_{j=i+1}^n a_i a_j $$
Is it possible to simplify it down and maybe lose one of the sigmas?
Thank you in advance :)