No. If they are even numbers and not 2, they are not prime.
20 is divisible by 1, 2, 4, 5, 20, and 20.
18 is divisible by 1, 2, 3, 6, 9, and 18.
No, they are not relatively prime.
No, they are not relatively prime.
Yes, they are relatively prime.
yes, they are relatively prime.
No, they are not.
no
Yes, they are. 5 is the only prime factor of 25 and 5 is not a factor of 18, so they have no prime factors in common, which is what relatively prime means.
No combinations of even numbers can be relatively prime.
No.
Yes, 3 and 20 are relatively prime because they have no common factor greater than 1.
Yes.
Yes