Find the missing number in above figure :

18

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9

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10

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20

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Solution

The correct option is C $18$
$5^{2} (5 - 1) = 100$
$7^{2} \times (7 - 1) = 294$
$∴ 3^{2} (3 - 1) = 18$ .
$∴$ The solution is $18$ .

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