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: 8, 3, 21 Row 2: 11, 9, 24 Row 3: 11, 2, ?
- 125
- 31
- 117
- 169
Answer
B. 31
Solution
Third number = 3a − b (with a = first number, b = second number). Row 1: 8, 3 → 21; Row 2: 11, 9 → 24. Row 3: 11, 2 → 31.
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