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How to derive a formula for the first n powers of an integer? In particular, sum of 2^n? I'm looking for a proof that not only utilizes algebraic manipulation but is also easily seen visually.

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    Probably you mean the sum of a geometric progression: http://en.wikipedia.org/wiki/Geometric_progression2012-03-14
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    Yes, I think this is a specific type of geometric progression. However, I'm looking for a proof that not only utilizes algebraic manipulation but is also easily seen visually.2012-03-14

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