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If the coefficient of x^2 and x^3 in the...

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 ...

A

`-7/9`

B

`-9/7`

C

`7/9`

D

`9/7`

Text Solution

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The correct Answer is:
D
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