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(Solved): chapter 11 how to solve  Find the sum of \( \sum_{n=1}^{\infty}\left[\frac{3}{n^{2}+n}+(-1 ...



chapter 11 

how to solve 

Find the sum of \( \sum_{n=1}^{\infty}\left[\frac{3}{n^{2}+n}+(-1)^{n}\right] \), if exists 3 0 does not exist 1
Find the sum of \( \sum_{n=1}^{\infty}\left[\frac{3}{n^{2}+n}+(-1)^{n}\right] \), if exists 3 0 does not exist 1


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