Yes.
Yes, 11 and 51 are relatively prime.
It can be. 50 is relatively prime to 51.
Yes, they are relatively prime.
Yes.
No.
No.
No.
No
52
No.
They are not relatively prime. To be relatively prime, the only common factor they could have would be the number 1. Both also have the number 3 as a common factor, so they are not relatively prime.