Which of these are co-prime numbers?

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3 and 30

11 and 110

4 and 15

6 and 12

answer is B.

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Detailed Solution

By the definition of co-prime numbers, if the given set of numbers has 1 as the only common factor, then the given numbers are said to be co-prime numbers.

Factors of 4: 1, 2, 4
Factors of 15: 1, 3, 5, 15

Here, 4 and 15 have 1 as the common factor. So, 4 and 15 are co-prime.

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