let u_n = (1/(√(n−1))) +(2/(√n)) +(1/(√(n+1))) calculate Σ_(n=2) ^∞ u


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Question Number 41704 by abdo.msup.com last updated on 11/Aug/18

$l e t u_{n} = \frac{1}{\sqrt{n - 1}} + \frac{2}{\sqrt{n}} + \frac{1}{\sqrt{n + 1}}$ $c a l c u l a t e \sum_{n = 2}^{\infty} u_{n}$
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