Question 12
Select the option that is related to the third number in the same way as the second number is related to the first number.
3 : 51 :: 7 : ?
Solution
In 3 : 51,
$$(3)^3 \times 2 - 3$$ = 27 $$\times$$ 2 - 3 = 54 - 3 = 51
Similarly,
$$(7)^3 \times 2 - 7$$ = 343 $$\times$$ 2 - 7 = 686 - 7 = 679
$$\therefore$$ The correct answer is option D.
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