What is the reciprocal ratio of $21 : 31$ ?

42 : 62

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62 : 42

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35 : 37

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31 : 21

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Solution

The correct option is D $31 : 21$
The reciprocal ratio of $a : b$ is $b : a$
$∴$ reciprocal ratio of $21 : 31$ is $31 : 21$

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\frac{{(3 \frac{2}{3})}^{2} - {(2 \frac{1}{2})}^{2}}{{(4 \frac{3}{4})}^{2} - {(3 \frac{1}{3})}^{2}} \div \frac{3 \frac{2}{3} - 2 \frac{1}{2}}{4 \frac{3}{4} - 3 \frac{1}{3}}

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(2^{2}) + (2^{2} + 4^{2}) + (2^{2} + 4^{2} + 6^{2}) + \dots (2^{2} + 4^{2} + 6^{2} + \dots \dots + (2 n)^{2}) (n t e r m s)

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