Find the formula for the nth term an 1,-1/1x3,1/1x3x5, -1/1x3x5x7, 1/1x3x5x7x9

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Find the formula for the nth term an 1,-1/1x3,1/1x3x5, -1/1x3x5x7, 1/1x3x5x7x9

[From: ] [author: ] [Date: 12-04-12] [Hit: ]

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an = (-1)^(2n-1)/(1x3x5x...(2n-1)) = ((-1)^(2n-1))(2n)!/((2^n)n!)

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