The sum of coefficient of even powers of `x` in `(x +sqrt(x^(3) - 1))^(6) + (x-sqrt(x^(3)-1))^(6)` is: (A) 23 (B) 24 (C) 18 (D) 21

Sum of coefficients of terms of even powers of x in (1 - x + x^2 - x^3)^7 is

Sum of coefficients of terms of even powers of x in (1 - x + x^2 - x^3)^7 is

Sum of coefficients of terms of even powers of x in (1 + x + x^2 + x^3)^5 is

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

The sum of coefficients of odd powers of x in the expansion of (1+x-x^2-x^3)^6 is

Sum of coefficient of even powers of x in the expansion of (1+x+x^(2)+x^(3))^(5) is:

The sum of the coefficients of all even degree terms in x in the expansion of (x+sqrt(x^(3)-1))^(6)+(x-sqrt(x^(3)-1))^(6) , (xlt1) is equal to 4k. The value of k is ________