Thread: Binomial Theorem Problem
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Old August 27th, 2008, 06:30 AM
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Hello,

Your sum can be written S_n=\sum_{i=0}^n\binom{n}{i}(-1)^i1^{n-i} which looks like \sum_{i=0}^n\binom{n}{i}x^iy^{n-i}=(x+y)^n, doesn't it ?
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