Question
Select the option that is related to third number cluster in the same way second number cluster is related to first number cluster.
12 : 9 :: 13 : ?
Solution
The logic followed here is as follows: The second number is the sum of all the digits of the square of first number. 12 → 12 × 12 = 144 → [1 + 4 + 4] = 9
Similarly, in 13 → 13 × 13 = 169 → [1 + 6 + 9] = 16
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