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Q)

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

$\begin{array}{1 1} \frac{3}{7} \\ \frac{7}{3} \\ \frac{9}{7} \\ \frac{7}{9} \end{array}$

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