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- Apr 13th 2012, 10:49 AM #1

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- Nov 2011
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## Sum of x^-n

I'm struggling with the following sum:

I've tried using a geometric series with the nth term equaling where , and using the geometric sum of the first N+2 terms:

but I don't think thats correct. I just checked in Wolfram Alpha and the answer there is mine multiplied by so I'm probably just missing something simple.

Not really sure what to do really so any help would be appreciated.

- Apr 13th 2012, 11:17 AM #2

- Apr 13th 2012, 11:23 AM #3

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