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The coefficients of x^(-n) in (1+x)^(n...

The coefficients of `x^(-n)` in `(1+x)^(n)(1+(1)/(x))^(n)` is

A

1: 0

B

2: 1

C

3: `2 n `

D

4: `2 n C_(n) `

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The correct Answer is:
B
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