No, they are not relatively prime.
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Yes, they are relatively prime.
Yes, 20 and 24 are relatively prime. The only factor they share is 1.
If you don't include 20, 25 and 30, all of the numbers in that range are relatively prime to 25.
10=2*5 Any number that doesn't have a factor of 2 or 5 is relatively prime to 10. e.g. 3, 7, 11, and 21 are all relatively prime to 10. 2, 5, 15, 16, and 20 are not relatively prime since they share a factor or 2 or 5 (or both, which means they share a factor of 10, e.g. 20).
2 and 19 are the prime factors of 76.