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1 . log25400=x

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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