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Q)

The coeff. of $x^n$ in the expansion of $(1+x)(1-x)^n$ is ?

$\begin{array}{1 1} (-1)^{n-1}.n \\ (-1)^{n}.(1-n) \\ (-1)^{n-1}.(n-1)^2 \\ (n-1) \end{array}$

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