Findthe coefficient of `x^4` in te expansion of `(1+x+2x^2)^6`

Find the coefficients of x^4 in the expansion of (1+x+x^2)^3

Find the coefficient of x^4 in the expansion of (1+x+x^2+x^3)^6

Find the coefficient of x^4 in the expansion of (1+x+x^2 +x^3 )^11 x^4 in the expansion of (2-x+ 3 x^2)^6

Find the coefficient of x^(11) in the expansion of (1+2x+x^(2))^(6)

Find the coefficient of x^(4) in the expansion of (2-x+3x^(2))^(6)

The coefficient of x^(4) in the expansion of (1-x)^(-2) is

If |x|<1, then find the coefficient of x^(n) in the expansion of (1+2x+3x^(2)+4x^(3)+...)^(1/2)

Find the coefficient of x^(4) in the expansion of (3x^(2)+2x)/((x^(2)+2)(x-3)) specifying the region which the expansion is valid.

The coefficient of x^(4) in the expansion of (1+x+x^(2))^(6) is