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April 20, 2015

April 20, 2015

Posted by **Kathryn** on Wednesday, September 22, 2010 at 12:04pm.

- 12th grade -
**MathMate**, Wednesday, September 22, 2010 at 12:09pmHint:

(1-x^n) = (1-x)(1+x+x²+x³+...+x^{n-1})

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