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Mathematics 16 Online
OpenStudy (anonymous):

Formula of 1^2+2^2+....+n^2 Formula of a^1+a^2+....+a^n who know?

OpenStudy (anonymous):

@Luis_Rivera

OpenStudy (anonymous):

+proof :D plz

OpenStudy (experimentx):

|dw:1360347673630:dw| here is another visual proof http://mathoverflow.net/questions/8846/proofs-without-words/69756#69756

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