No. They have many common factors, not just 1.
211 is a prime number, and is not a factor of 210, so yes, they are relatively prime.
It can be. 21 is relatively prime with 32.
209 is relatively prime (as is 211).
Yes, 210 and 211 are relatively prime. Any numbers whose difference is 1 will only have 1 as a common factor, so they will be relatively prime.
Yes.
Yes, they are relatively prime.
Yes, they are relatively prime.
Yes, they are relatively prime.
Yes, they are relatively prime.
Yes, they are relatively prime.
Yes, they are relatively prime.
Yes, they are relatively prime.