A set of integers are coprime if they have no factors greater than 1 in common. For example, 9 and 10 are coprime. The factors of 9 are 1, 3, and 9. The factors of 10 are 1, 2, 5, and 10. Since 9 and 10 have no factors other than 1 in common, 9 and 10 are coprime. Coprime integers can also be called relatively prime.
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