Leetcode 724: Find Pivot Index -Javascript

This is another array problem. It's an easy problem but I believe it's important for the build-up to harder problems. Try to solve it here -
and show your solutions!!. I really want to see how you solved it!

[stupidbutcurious]

Hi can you please help me solve this question please:-
The Question is:- Given an array of integers of size N, count all possible distinct triplets whose sum is exactly divisible by given integer K. for triplets i, j, k --> i<j<k