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

Find the coefficient of x^5 in the expansion of (x+3)^9

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

Find the coefficient of x^9 in the expansion of (x^2-1/(3x))^9 .

Find the coefficient of x^9 in the expansion of (x^2-1/(3x))^9 .

The coefficient of x^5 in the expansion of (x+3)^8

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

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

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