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Re: Help please, Agility of Power Series


Jerry Huang wrote:

> IF a f(x)= the summation of nx^n from 1 to infinity
>
> Find the closed form for f(x) by calculating the result of (1+x)*f(x)
>
>

Can't do your homework for you, but instead of  (1+x)*f(x)try
(1-x)*f(x).

Cheers,
        Bill



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