What is the reciprocal ratio of $9 x^{2} : 11 x^{2}$ ?

11 x^{2} : 9 x^{2}

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121 x^{2} : 81 x^{2}

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22 x^{2} : 18 x^{2}

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81 x^{2} : 12 x^{2}

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Solution

The correct option is A $11 x^{2} : 9 x^{2}$
The reciprocal ratio of $a : b$ is $b : a$
$∴$ reciprocal ratio of $9 x^{2} : 11 x^{2}$ is $11 x^{2} : 9 x^{2}$

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The given expression: 2s²+3r+5u² +10p+6r+7s², on simplification gives:

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