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Definition of Functions

Find the numb...

Question

Find the number which replace the question mark.
$08 : 28 :: (?) : 65$

A

9

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B

12

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C

15

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D

18

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Solution

The correct option is C $15$
We can write the given numbers as,
$(08 = 3^{2} - 1) : (28 = 3^{3} + 1) :: (? = 4^{2} - 1) : (65 = 4^{3} + 1)$

Hence, $? = 15$

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