Question: Question in picture : Prove that for Vn E N, 13 + 23 + ... + n' = [-n(n+1)]2 2

Question in picture :
![+ 23 + ... + n' = [-n(n+1)]2 2](https://s3.amazonaws.com/si.experts.images/answers/2024/06/66707a860af24_42966707a85ecc2b.jpg)
Prove that for Vn E N, 13 + 23 + ... + n' = [-n(n+1)]2 2
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