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

Coefficient of x^n in the expansion of (1+x)^(2n) is

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

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

If n is a positive integer then the coefficient of x ^(-1) in the expansion of (1+x) ^(n) (1+ (1)/(x)) ^(n) is-

The coefficient of (1)/(x) in the expansion of ((1)/(x)+1)^(n)(1+x)^(n) is

If n is a positive integer,find the coefficient of x^(-1) in the expansion of (1+x)^(n)(1+(1)/(x))^(n)

If n is even then the coefficient of x in the expansion of (1+x)^n*(1-1/x)^n is ______.

The coefficient of x^n in the expansion of (1+x)^(2n) and (1+x)^(2n-1) are in the ratio.

If A and B are the coefficients of x^n in the expansion (1 + x)^(2n) and (1 + x)^(2n-1) respectively, then