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Need help with Sigma summation equation

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Hint:

(1/2+1/4+1/8+1/16+1/32+...)

+(1/4+1/8+1/16+1/32+...)

+(1/8+1/16+1/32+...)

=1/2+2/4+3/8+...
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Take the derivative of the geometric series and plug in 1/2. That pretty much gives it away, but it's a classic trick you'll want to recognize by the *n* on top.

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