What is the reciprocal ratio of $81 : 121$ ?

8 : 12

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11 : 9

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9 : 11

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121 : 81

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Solution

The correct option is D $121 : 81$
The reciprocal ratio of $a : b$ is $b : a$
$∴$ reciprocal ratio of $81 : 121$ is $121 : 81$ .

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