Civil Service Exam Reviewer · Logical Reasoning · hard
In each row, the third number is obtained from the first two by the same rule. Find the missing number. Row 1: 6, 5, 61 Row 2: 12, 5, 169 Row 3: 12, 9, ?
- 63
- 441
- 225
- 129
Answer
C. 225
Solution
Third number = a² + b² (with a = first number, b = second number). Row 1: 6, 5 → 61; Row 2: 12, 5 → 169. Row 3: 12, 9 → 225.
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