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The factors of 15 are: 1, 3, 5, and 15.
The prime factors of 15 are: 3 and 5.

The factors of 21 are: 1, 3, 7, and 21.
The prime factors of 21 are: 3 and 7.

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Is 15 and 21 relatively prime?

Yes, 15 and 21 are relatively prime because they have no common positive factors other than 1. The prime factorization of 15 is 3 and 5, while the prime factorization of 21 is 3 and 7. The only common factor is 3, which means they are not relatively prime.


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