I'm trying to figure out how to do this sum and not sure where to start:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \sum_{n = -\infty}^{-1} \left(\frac{1}{2}e^{-j \omega} \right)^n [/tex]

I tried rewriting it like this:

[tex] \sum_{m = 1}^{\infty} (2e^{j \omega})^m [/tex]

m = -n

but I'm not sure if that helps.

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# Infinite Sum

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