The mean proportional of the following pairs : $8, 18$

12

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45

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21

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47

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Solution

The correct option is C $12$
Mean proportional of two numbers, $a$ and $b$ is $\sqrt{a b}$
So, mean proportional of $8, 18$ is $\sqrt{8 \times 18} = \sqrt{4 \times 2 \times 9 \times 2} = 2 \times 3 \times 2 = 12$

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