No, 77 adn 791 are not relatively prime; 7 is a common factor of 77 and 791
No.
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Yes, 24 and 77 are relatively prime.
As 77 = 7 x 11, any number that is not a multiple of 7 or 11 is relatively prime to 77, e.g. 25, 38, 123
No.
The GCF of 15 and 77 is 1. The factors of 15 are 1, 3, 5, and 15. The factors of 77 are 1, 7, 11, and 77. The common factors are 1. Therefore the greatest common factor is 1, which means the two numbers are relatively prime. The greatest common factor can also be determined by prime factors. The prime factors of 15 are 3 and 5. The prime factors of 77 are 7 and 11. There are no common prime factors, so the two numbers are relatively prime, which means their only common factor is 1.
Yes, it is prime.791 is a composite number because it has at least one positive factor other than one or itself.