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If $\log 3 = 0.4771$ then $\log 3 + \log 15 =$

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2.1492

1.2143

2.103

1.65

answer is D.

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Detailed Solution

$\begin{array}{l} \log 3 + \log 15 = \log 3 + \log (3 \times 5) \\ = \log 3 + \log 3 + \log 5 = 2 \log 3 + \log 5 (∵ \log 5 = 0.698) \\ = 0.9542 + 0.698 \\ = 1.65 \end{array}$

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