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Math Help - finding the sum of inifinite series

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    finding the sum of inifinite series

    Hi , how can we find the following sum for a series: \sum_{n=1}^{\infty} n^{p}/q^{n} for given p and q ? .E.g if p = 0 and q = 3 the series becomes 1/3 + 1/9 + 1/27 + ... = 1/2 . So required value is 1/2

    Thanks.
    Last edited by pranay; October 6th 2012 at 10:43 PM.
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