Mathematics
Which of the following is a pair of co-prime numbers?
8, 45
3, 18
5, 35
6, 39
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Answer
8, 45: 8 = 2³, 45 = 3² × 5. No common factor other than 1. Co-prime ✓
3, 18: 18 = 2 × 3². Common factor is 3. Not co-prime.
5, 35: 35 = 5 × 7. Common factor is 5. Not co-prime.
6, 39: 6 = 2 × 3, 39 = 3 × 13. Common factor is 3. Not co-prime.
Hence, option 1 is the correct option.
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