If the coefficient of `x^2` and `x^3` in the, expansion of `(3 + kx)^9` are equal, find k.

If the coefficient of x^2 and x^3 in the expansion of (3 + ax)^9 are the same, then the value of a is ...

Find the coefficient of x^3 in the expansion of (x^2 + (3 sqrt 2)/x)^9

Find the coefficient of x^6 in the expansion of (3x^2 - 1/ (3x))^9

Find the coefficient of x^-3 in the expansion of (x -1/(2x))^5

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

Find the coefficient of x^17 in the expansion of (3x - (x^3/6))^9