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Q: Is 25 a relatively prime

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Yes, they are relatively prime.

It can be. 16 is relatively prime with 25.

It can be. 36 is relatively prime to 25. 36 is not relatively prime to 21.

Yes, they are. 5 is the only prime factor of 25 and 5 is not a factor of 18, so they have no prime factors in common, which is what relatively prime means.

Relatively prime, yes.

25 and 98 are not prime numbers

no

Yes, e.g. 3 and 5 are relatively prime, 27 (33) and 25 (52) are relatively prime...

25 and 36 are relatively prime because they both share 1 as a factor, but no other factor. As their only common factor is 1, they are relatively prime. Neither is a prime number itself, but it is about the common factors, so in relation to each other, they are relatively prime.

26

No.

No.

No. To be relatively prime, the only common factor they could have would be the number 1. They also have 5 as a common factor, so they are not relatively prime.

Yes, e.g. 3 and 5 are relatively prime, 27 (33) and 25 (52) are relatively prime...

Yes.

Yes

Yes.

Yes.

Two numbers which are "relatively prime" have no common prime factors. To illustrate, let's write several numbers in terms of their prime factors: 24 = 2 x 2 x 2 x 3 25 = 5 x 5 42 = 2 x 3 x 7 70 = 2 x 5 x 7 You can see that 24 and 25 are relatively prime, because they don't share any common prime factors. Likewise, 25 and 42 are relatively prime. 24 and 42, however, are NOT relatively prime because they share the common factors of 2 and 3. Likewise 25 and 70 are NOT relatively prime because they share the common factor 5. When a fraction is in its simplest form, the numerator and denominator are relatively prime.

The greatest common factor of 25 and 72 is 1, so they are relatively prime.

Yes, they are.

No because 24 has more than 2 factors also 25 has more than 2 factors so they are both composite so not relatively prime.

The GCF of two prime numbers is 1. 4, 9 and 25 are relatively prime.

25, among others.

No, both are divisible by 25.