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Neither 50 nor 51 are prime numbers.
50 is a composite number. 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.
1 and 0 are neither composite or prime numbers
As an even number greater than 2, 50 is divisible by 2, and therefore a composite number.
A single number cannot be relatively prime. Any pair of numbers between 50 and 100 of which one is a prime will be relatively prime. There are 728 pairs of numbers that are relatively prime and I have neither the time nor patience to list them all!