The number 1 is the only common factor of co-prime numbers, which is what makes them co-prime. 9 and 10 for example or 15 and 23.
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Two numbers are co-prime if they do not have any common factors. The numbers themselves need not be prime.
Such numbers are relatively prime, or co-prime.
co-prime or relatively prime
The numbers are co-prime so the only common factor is 1.
Yes, because their only common factor is 1.