Hey I need help with the following problem: the series from n=1 to infinity of 12/[(-5)^n) I know it is a geometric series, and that c=12/-5 and r=-1/5, but i don't understand why Thanks for the help
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Originally Posted by luckeyduck Hey I need help with the following problem: the series from n=1 to infinity of 12/[(-5)^n) I know it is a geometric series, and that c=12/-5 and r=-1/5, but i don't understand why Thanks for the help $\displaystyle \sum_{n=1}^{\infty}\frac{12}{(-5)^n}=12\sum_{n=1}^{\infty}\left( -\frac{1}{5}\right)^n$ Does this help?
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