The GCF of 26 and 65 is 13. 13 is a Prime number. "Relatively prime" refers to numbers whose GCF is 1.
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No, 60 and 75 are not relatively prime because their greatest common factor is 15 and not 1. In order for them to be relatively prime, 1 must be their greatest common factor.
co-prime or relatively prime
Such numbers are relatively prime, or co-prime.
No, 100 and 202 are not relatively prime. Relatively prime numbers only have the number 1 as a common factor. The number 1 is a common factor for them, but the number 2 is another common factor that they have, so they are not relatively prime.
The greatest common factor of 21 and 121 is 1. (21 and 121 are relatively prime.)