- A0
- B2
- C3
- D4
Step-by-Step Solution
Common factors: 8, 15 → 1; 12, 18 → 6; 9, 21 → 3; 14, 25 → 1; 16, 27 → 1; 10, 35 → 5. So 3 pairs are co-prime. The numbers need not be prime themselves.
Answer: C) 3
Two numbers are co-prime if their only common factor is 1. How many of the card pairs shown are co-prime?
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