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: 11, 5, 96 Row 2: 11, 7, 72 Row 3: 6, 2, ?
- 40
- 64
- 20
- 32
Answer
D. 32
Solution
Third number = a² − b² (with a = first number, b = second number). Row 1: 11, 5 → 96; Row 2: 11, 7 → 72. Row 3: 6, 2 → 32.
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