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12 and 35 are mutually prime as they have no common factors other than 1.
The prime factors of 20 are 2, 2 and 5 The prime factors of 35 are 5 and 7 Therefore the greatest (and, other than 1, the only) common divisor of 20 and 35 is 5.
5
Relatively prime. In mathematics, the integers a and b are said to be co-prime or relatively prime if they have no common positive factor other than 1 or, equivalently, if their greatest common divisor is 1. for example 6 and 35 are co-prime. (neither is prime) 6 has the prime factors of 2 & 3, 35 has the factors 5 & 7.
1, 5, 7, 35 5 and 7 are prime.