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What's a Clip?
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A Clip 'n Share page is a cached "clipped" image of one small section of a full Wolfram|Alpha result. You can recompute the full result page from the clip, as long as it does not depend on private data from a user.
[ x(1-x^N) ] / [1-x]
Derivative:
This clip was created on October 23, 2015, with Wolfram|Alpha.
Compute full result
[ x(1-x^N) ] / [1-x]