5 and 8
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No, coprime numbers have no common factors other than one; 15 and 24 both have the factor 3, so they are not coprime.
Only 1: the two numbers are coprime.
The GCF is 1.
18 factors to [2 3 3] 34 factors to [2 17] They have a common factor of 2, so they are not coprime.
There are 490 coprime pairs and I have neither the time nor inclination to list them all.