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Question
Which of the following are co-primes?
Options
8, 12
9, 10
6, 8
15, 18
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Solution
9, 10
8, 12 are not co-primes as they have a common factor 4.
9, 10 are co-primes as they do not have a common factor.
6, 8 are not co-primes as they have a common factor 2.
5,18 are not co-primes as they have a common factor 3.
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