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1 . log381=

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Answer: Option C

Explanation:

\log_{\sqrt{3}} 81 = \log_{\sqrt{3}} {(\sqrt{3})}^{2 \times 4} = \log_{\sqrt{3}} {(\sqrt{3})}^{8} = 8 \log_{\sqrt{3}} \sqrt{3} = 8 \times 1 = 8