The coefficient of `x^(18)` in the expansion `(1+x)(1-x)^(10)(1+x+x^(2))^(9)` is

The coefficient of x^(18) in the product (1+x)(1-x)^(10)(1+x+x^(2))^(9) is k. The value of (k)/(12) is __________.

The coefficient of x^(18) in the product (1+x)(1-x)^(10)(1+x+x^(2))^(9) is k. The value of (k)/(12) is __________.

The coefficient of x^(18) in the product (1+x)(1-x)^(10)(1+x+x^(2))^(9) is

The coefficient of x^(18) in the product (1+x)(1-x)^(10)(1+x+x^(2))^(9) is

The coefficient of x^(7) in the expansion of (1+x)^(9) is

The coefficient of x^9 in the expansion of (1-5x)/(1+x) is

The coefficient of x^9 in the expansion of (1-5x)/(1+x) is

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