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, 4, 18 Row 2: 10, 6, 50 Row 3: 12, 7, ?
- 72
- 193
- 95
- 361
Answer
A. 72
Solution
Third number = ab − a (with a = first number, b = second number). Row 1: 6, 4 → 18; Row 2: 10, 6 → 50. Row 3: 12, 7 → 72.
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