Coefficient of `x^(18)in(1+x+2x^2+3x^3++18 x^(18))^2` equal to `995` b. `1005` c. `1235` d. none of these

Coefficient of x^(18)in(1+x+2x^(2)+3x^(3)+...+18x^(18))^(2) equal to 995b.1005c.1235d .none of these

The coefficient of x^(17) in (x-1)(x-2)(x-3). . . (x-18) is:

Coefficient of x^18 in (x^2 + 1)(x^2 + 4)(x^2 + 9)….(x^2 + 100) is

Coefficient of x^18 in (x^2 + 1)(x^2 + 4)(x^2 + 9)….(x^2 + 100) is

The coefficient of x^(8)y^(10) in the expansion of (x+y)^(18) is ^(18)C_(8) b.^(18)P_(10) c.2^(18) d.none of these

Find the coefficient of x^(18) in (x^2+2+1/(x^2))^(-5)(1+x^2)^(40)dot

Find the coefficient of x^(-2) in (1+x^(2)+x^(4)) (1-1/(x^(2)))^(18)

Find the coefficient of x^(-2) in (1+x^(2)+x^(4)) (1-1/(x^(2)))^(18)

3x=2x+18