The sum of the coefficients of even powers of x in the expansion of `(1+x+x^2)^15` is

The sum of the coefficients of even power of x in the expansion of (1+x+x^2+x^3)^5 is 256 b. 128 c. 512 d. 64

The sum of the coefficients of even power of x in the expansion of (1+x+x^2+x^3)^5 is a. 256 b. 128 c. 512 d. 64

The sum of the coefficients of even power of x in the expansion of (1+x+x^2+x^3)^5 i s 256 b. 128 c. 512 d. 64

The sum of the coefficient of odd powers of x in the expansion of (1+x+x^2)^15 is

The sum of the coefficients of even power of x in the expansion of (1+x+x^(2)+x^(3))^(5) is 256 b.128c.512d.64

The sum of the coefficients of even powers of x in the expansion (1-x+x^(2)-x^(3))^(5) is