Yes, 11 and 51 are relatively prime.
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.
It can be. 50 is relatively prime to 51.
Yes, they are relatively prime.
No.
No.
No.
No
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 51 is composite, 119 is prime.
52
Yes.
Yes.