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Possible Duplicate:
How to find the sum of this infinite series

Hello all, I have one last major question, where would I get started on the following question:

$$\sum_{n=0}^{\infty}\frac{n}{3^n}$$

I know it is a series (obviously), and I think it is geometric, but I have no idea as to how to start it. Does anyone have any first steps/tips as to what I could do for this?

Thanks so much in advance!

Edit: Per the first comment on my posting, by 1hf, see:

Very close to How can I evaluate $\sum_{n=0}^\infty (n+1)x^n$

In particular, see the answer at How can I evaluate $\sum_{n=0}^\infty (n+1)x^n$

Thanks all!

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    Very close to http://math.stackexchange.com/questions/30732/how-to-find-the-sum-of-this-infinite-series . In particular, see the answer at http://math.stackexchange.com/questions/30732/how-to-find-the-sum-of-this-infinite-series/30747#307472011-05-02
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    Thanks! If you put that in a answer form, I can give you credit for the answer easier :)2011-05-02

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