(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Find the sum [tex]\sum_{0}^{\infty} \frac {n^2} {3^n}[/tex]

2. Relevant equations

3. The attempt at a solution

I don't know how to go about finding this sum, I have a guess of what it will be just by adding the first ten terms or so, but how do I find an actual approximation?

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# Find the sum

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