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

Find the coefficient of x^7 in the expansion of (1 - x -x^2 + x^3)^(6)dot

Find the coefficient of x^7 in the expansion of (1 - x -x^2 + x^3)^(6)dot

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

Find the coefficient of x^6 in the expansion of (1+ x^2 - x^3)^8

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

Find the coefficient of x^4 in the expansion of (1-x^2)^n

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

Find the coefficient of x^6 in the expansion of (1/x^2 + x^4)^18

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