No.
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All numbers greater than one in that range can be co-prime. 4 and 9 are co-prime.
No, 12 and 18 are not coprime. Their common factors are 2, 3, and 6.
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.
Co-prime numbers, like 4 and 9, are any set of integers that have a GCF of 1.
Two numbers, like 4 and 9, are considered co-prime if their GCF is 1.