2020 AMC 12B Problems/Problem 13

Problem

Which of the following is the value of $\sqrt{\log_2{6}+\log_3{6}}?$

$\textbf{(A) } 1 \qquad\textbf{(B) } \sqrt{\log_5{6}} \qquad\textbf{(C) } 2 \qquad\textbf{(D) } \sqrt{\log_2{3}}+\sqrt{\log_3{2}} \qquad\textbf{(E) } \sqrt{\log_2{6}}+\sqrt{\log_3{6}}$

Solution 1 (Logic)

Using the knowledge of the powers of $2$ and $3$ , we know that $\log_2{6}$ is greater than $2.5$ and $\log_3{6}$ is greater than $1.5$ . So that means $\sqrt{\log_2{6}+\log_3{6}} > 2$ . Since $\boxed{\textbf{(D) } \sqrt{\log_2{3}} + \sqrt{log_3{2}}}$ is the only option greater than $2$ , it's the answer. ~Baolan

2020 AMC 12B (Problems • Answer Key • Resources)
Preceded by Problem 12	Followed by Problem 14
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2020 AMC 12B Problems/Problem 13

Problem

Solution 1 (Logic)

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