- #1
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Homework Statement
In order to solve the problem I am working on, I have to prove the following generalized problem,
[tex]S(x)=\sum_{n=0}^{\infty} n x^n =\frac{x}{(x-1)^2}[/tex] for |x|< 1
I evaluated this sum using Wolfram Alpha. Clearly it looks related to the geometric series solution, but I am unsure how to prove this identity. Any ideas to get me started?