Term independent of x in the expansion of `(3x^2-1/(3x))^9`.

Explanation

` (frac{3}{2} x^{2}-frac{1}{3 x})^{9} `


`T_{r+1}=\ ^{9} C_{r}(frac{3}{2} x^{2})^{9-r}(frac{-1}{3 x})^{r} `


`=(-1)^{r} 9 C_{r cdot} cdot frac{3^{9-2 r}}{2^{9-r}} times x^{18-2 r-r}`


term to be independent of `x`, we have
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