I really don't know how to find the sum of the series: n−1∑k=1k(n−k)2=1(n−1)2+2(n−2)2+3(n−3)2+⋯+(n−1)12.
My attempt:
I tried to approach the old school approach of how we find the sum of arithmetic-co geometric progression but unable to do so.
Any help is appreciated!
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