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[" The coefficient of "x^(n)" in the exp...

[" The coefficient of "x^(n)" in the expansion of "],[(1+x)(1-x)^(n)" is "],[[" (a) "(n-1)," (b) "(-1)^(n)(1-n)],[" (c) "(-1)^(n-1)(n-1)^(2)," (d) "(-1)^(n-1)n]]

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