Civil Service Exam Reviewer · Logical Reasoning · medium

Find the missing number: 12 : 169 :: 11 : 144 :: 8 : ?

1. 63
2. 72
3. 504
4. 81

Answer

D. 81

Solution

Rule: each number is paired with (n + 1)². Check: 12 → 169 and 11 → 144. So 8 → 81.

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