The coefficient of `x^(4)` in the expansion of `(1-x)^(-2)` is

The coefficient of x^(r) in the expansion of (1-x)^(-2) is

The coefficient of x^(4) in the expansion of (1+x-2x^(2))^(7) is :

The coefficient of x^(4) in the expansion of (1-x-2x^(2))^(8) is

prove that the coefficient of x^(n) in the expansion of (1+x)^(2n) is twice the coefficient of x^(n) in the expansion of (1+x)^(2n-1)

The coefficient of x^(r) in the expansion of (1-2x)^(-(1)/(2)) is

The coefficient of x^(4) in the expansion of (1+x+x^(2))^(6) is

What is the coefficient of x^(4) in the expansion of ((1-x)/(1+x))^(2) ?

Coefficient of x^(4) in the expansion of (1)/((x+1)(x+2)) is