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

The coefficient of x^5 in the expansion of (1+x^2)(1+x)^4 is (a) 12 (b) 5 (c) 4 (d) 56

The coefficient of x^5 in the expansion of (1+x^2)(1+x)^4 is

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

If sum of the coefficients in the expansion of (x+1/x)^(n) is 128, then coefficient of x in the expansion of (x+1/x)^(n) is

The coefficient of x^(n) in the expansion of ((1 + x)/(1-x))^(2), is

The coefficient of x^(n) in the expansion of ((1 + x)/(1-x))^(2), is

The coefficient of x in the expansion of (1 + x)(1 + 2x)(1 + 3x) ... (1 + 100x) is