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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

`(-1)^(n-1)(n-1)^(2)`

B

`(-1)^(n)(1-n)`

C

n-1

D

`(-1)^(n-1)n`

Text Solution

Verified by Experts

The correct Answer is:
B
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