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1. $\log 2 {\sqrt{5}}^{400 = x}$

Answer: Option A

Explanation:

\log_{2} {\sqrt{5}}^{400} = x \Rightarrow {(2 \sqrt{5})}^{x} = 400 \Rightarrow {(2 \sqrt{5})}^{x} = {(2 \sqrt{5})}^{4} ∴ x = 4

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