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1. $9^{2 x + 1}$

Answer: Option A

Explanation:

9^{2 x + 1} = 81 \Rightarrow 9^{2 x + 1} = 9^{2} \Rightarrow 2 x + 1 = 2 \Rightarrow 2 x = 1 \Rightarrow x = \frac{1}{2} (A n s)

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