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2Â¥: Originally posted by herowolf at 2014-08-10 16:53:53
(1+x)ⁿ = 1 + n¡¤x/1! + n(n-1)x2/2!  + n(n-1)(n-2)x3/3! + . . . + n(n-1)...(n-k+1)xⁿ/n! + . .

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3Â¥: Originally posted by guojiashun at 2014-08-10 19:43:10
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