Q: Is 15 and 30 are relatively prime?

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Yes, 4 and 15 are relatively prime.

No.

15 is relatively prime.

Yes, they are.

The numbers 15, 32, and 49 are relatively prime because their greatest common factor is 1.

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The gcf is 15; so 30 and 135 are not relatively prime. 30 = 2 x 3 x 5 135 = 33 x 5 hcf = 3 x 5 = 15 If the gcf of two numbers is 1, then they are relatively prime 15 ≠ 1, thus 30 and 135 are not relatively prime.

No. 15 is a common factor

No, 30 and 135 are not relatively prime.

A number cannot be relatively prime number by itself. It can only be relatively prime in the context of (relativeto) another number. That requires the two numbers not to have any prime factors in common.

Yes, 4 and 15 are relatively prime.

Yes, they are relatively prime.

Yes, they are relatively prime.

Yes, they are relatively prime.

15 is not a prime number, so it can't be a prime factor.

No, 30 and 40 are not relatively prime. Their greatest common factor is 10.

No, 30 and 36 are not relatively prime. They share the factors 3 and 6.

12 and 30 are not relatively prime because they have two common prime factors (2 and 3).