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In the expansion of (x-1/(3x^2))^9, the ...

In the expansion of `(x-1/(3x^2))^9,` the term independent of `x` is a. `T_3` b. `T_4` c. `T_5` d. none of these

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Suppose `T_{r+1}` is the term that is independent of x.
Thus, we have:
`T_{r+1}=\ ^{9} C_{r} x^{9-r}(frac{-1}{3 x^{2}})^{r}`
`=(-1)^{r 9} C_{r} frac{1}{3^{r}} x^{9-r-2 r}`
...
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