Find the coefficient of `x^7` in the expansion of `(2x^2+- 1/x)^20`

Find the coefficient of x^7 in the expansion of (3x^2+ 1/(5x))^11

Find the coefficient of x^(9) in the expansion of (2x^(2)-(1)/(x))^(20)

Find the coefficient of x^(-7) in the expansion of (2x-(1)/(3x^(2)))^(11)

Find the coefficient of x^(7) in the expansion of (ax^(2) + (1)/(bx))^(11) . (ii) the coefficient of x^(-7) in the expansion of (ax + (1)/(bx^2))^(11) . Also , find the relation between a and b , so that these coefficients are equal .

Find the coefficient of x^(7) in the expansion of (x^(2)+(1)/(x^(2)))^(11)

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

Find the coefficient of x^(8) in the expansion of (x^(2)-(1)/(x))^(10)

Find the coefficient of x^(-8) in the expansion of (x-1/(2x^2))^10

Find the coefficient of x^(-5) in the expansion of (2x^(2)-(1)/(5x))^(8)