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

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^(-2) in (1+x^(2)+x^(4)) (1-1/(x^(2)))^(18)

3x=2x+18

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

If (x^(2)+(1)/(x^(2)))=34, then (x+(1)/(x)) is equal to (a)3(b)4(c)5(d) None of these is equal

4 * 2 ^ (2x) -6 ^ (x) = 18 * 3 ^ (2x)