_____ is the subduplicate ratio of $49 : 169$

9 : 16

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7 : 13

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13 : 7

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169 : 49

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Solution

The correct option is B $7 : 13$
The subduplicate ratio of $a : b$ is $\sqrt{a} : \sqrt{b}$
$∴$ The subduplicate ratio of $49 : 169$ is $\sqrt{49} : \sqrt{169} = 7 : 13$

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Similar questions

13 \times 13 = 169

\sqrt{169}

49, 121, 169, 289, 371, 529

$7 + (49 \div (2 \times 3 + 1)) - 13 =$

(-9÷4×5÷3)-(-13÷2×6÷-169)

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