The first 3 terms in the expansion of (1+ax)n are 1, 12x, 64x2respectively, Find n and 'a' .

Given, first 3 terms in the expansion of (1+ax)n are 1, 12x, 64x2 respectively.

Now, na = 12

⇒ 9a = 12

⇒ a = 4/3

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