Which of the following is a pair of co-prime numbers?

3, 9

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5, 10

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4, 7

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4, 8

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Solution

The correct option is C 4, 7
Co-prime numbers have no common factors except 1.
Here, 3 is a common factor of 3 and 9, 5 is a common factor of 5 and 10, 4 is a common factor of 4 and 8 and 1 is the only common factor of 4 and 7.
Therefore 4 and 7 are co-prime numbers.

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