Find the missing number.
$6 ˸ 7 ∷ 18 ˸ ?$

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Solution

Given:
$6 ˸ 7 ∷ 18 ˸ ?$
Here one extreme is missing.
$One extreme = \frac{Product of means}{other extreme}$
$= \frac{7 \times 18}{6}$
$= 21$
Hence, the missing number is $21$

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3^{2} + 6^{2} + 18^{2} = 19^{2}

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