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3 and 2 are the only prime numbers with a difference of 1.
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.
Only 1 pair of prime numbers, 2 and 5, have a difference of 3. All prime numbers greater than 2 are odd so will have an even difference.
Numbers called relatively prime or mutually prime have no common factors or divisors other than 1. Numbers having any common factors or divisors greater than 1 are not relatively or mutually prime.
Any number, including prime numbers, can be multiplied by 1.