Q 1353891744.     The coefficient of `x^n` in the expansion `(1+x)(1-x)^n` is

A

`=(-1)^n [1-n]`

B

`=(-1)^n [1+n]`

C

`=(-1)^{n-1} n`

D

`=(-1)^n [n-1]`

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