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The coefficient of 1//x in the expansion...

The coefficient of `1//x` in the expansion of `(1+x)^n(1+1//x)^n` is `(n !)/((n-1)!(n+1)!)` b. `((2n)!)/((n-1)!(n+1)!)` c. `((2n)!)/((2n-1)!(2n+1)!)` d. none of these

A

`(n!)/((n-1)!(n+1)!)`

B

`(2(n)!)/((n-1)!(n+1)!)`

C

`(2(n)!)/((2n-1)!(2n+1)!)`

D

None of these

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The correct Answer is:
B
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