Civil Service Exam Reviewer · Logical Reasoning · hard

If 8 ★ 2 = 6, 3 ★ 2 = 1, then 9 ★ 2 = ?

1. 85
2. 7
3. 77
4. 121

Answer

B. 7

Solution

The rule is a ★ b = ab − a − b. Check: 8 ★ 2 → 6; 3 ★ 2 → 1. So 9 ★ 2 = 7.

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