Since 13 is a Prime number (i.e., 13 is the only factor of 13), any number that is not a multiple of 13 is relatively prime to it.
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No, 13 and 39 are not relatively prime. 13 is a factor of 39.
Lots of numbers are. To be relatively prime, they would have to have only the number 1 as a common factor. So any number that has any of 2, 3, 6, 9 or 18 as factors are not relative prime to 18. So numbers such as 5, 7, 11, 13 and 17 are relatively prime with 18.
They are not relatively prime. To be relatively prime, the only common factor they could have would be the number 1. Both also have the number 3 as a common factor, so they are not relatively prime.
13 is a prime number
Two numbers are considered relatively prime if they share no common factors other than 1. In this case, 26 and 39 are not relatively prime because they have a common factor of 13 (13 is a factor of both 26 and 39). Therefore, 26 and 39 are not relatively prime.