No. 1 is not their only common factor.
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5,7 3,5 are co-primes
215 and 216 are co-prime.
Any number greater than one can be co-prime. I guess the answer is 49.
Find their GCF. If the GCF of two numbers is 1, the numbers are co-prime.
Two numbers are said to be co-primes if they do not share any common divisor except for 1. For example, 9 and 10 are co-primes. Number 9 has factors 1,3,9 and 10 has 1,2,5,10. Only 1 is common. So, these two are co-prime numbers.