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The coefficient of x^(n) in the expansio...

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 `

Text Solution

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The correct Answer is:
B
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