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

The coefficient of `x^(n)` in the polynomial `(x+""^(2n+1)C_(0))(X+""^(2n+1)C_(1)) (x+""^(2n+1)C_(2))……(X+""^(2n+1)C_(n))` is

`2^(n+1)`

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

`2^(2n-1)`

`2^(2n)`

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