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Find the coefficient of \(x^n\) in the expansion of \((1+x)(1-x)^n\) |
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Answer» We have, Coefficient of \(x^n\) in \((1+x)(1-x)^n\) = coefficient of \(x^n\) in \((1-x)^n\) + coefficient of \(x^{n-1}\) in \((1-x)^n\) = \((-1)^n\) nCn+(-1)n-1nCn-1 =\((-1)^n(1-n)\) |
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