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1. $\log_{x} \frac{1}{81} = - 4$

Answer: Option D

Explanation:

\log_{x} \frac{1}{81} = - 4 ≫ \frac{1}{81} = x^{- 4} ≫ 3^{- 4} = x^{- 4} ∴ x = 3

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