Thread: finding the sum of inifinite series

Hi , how can we find the following sum for a series: 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.

sum[n^k/(r^n)] with n from 1 to infinity - Wolfram|Alpha