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Coefficient of 1/x in the expansion of ...

Coefficient of `1/x` in the expansion of ` (1 + x)^(n) (1 + 1//x)^(n)` is

A

`n!//[(n-1)!.(n+1)!]`

B

`2n!//[(n-1)!.(n+1)]`

C

`n!//[(2n-1)!.(2n+1)!]`

D

`2n ! //[2n-1)!. (2n+1)!]`

Text Solution

Verified by Experts

The correct Answer is:
b
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