Mark the correct alternative in each of the following: If the coefficients of \( x^{2} \) and \(...
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0Mark the correct alternative in each of the following:
If the coefficients of \( x^{2} \) and \( x^{3} \) in the expansion of \( (3+a x)^{9} \) are the same, then the value of \( a \) is
(A) \( -\frac{7}{9} \)
(B) \( -\frac{9}{7} \)
(C) \( \frac{7}{9} \)
(D) \( \frac{9}{7} \)
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