None: by definition.
None: by definition.
None: by definition.
None: by definition.
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1. The two numbers are coprime.
Two numbers are coprime if they have unity (1) as their only common factor. Example 1: 17 and 19 - any two prime numbers are also coprime. Example 2: 15 and 64 - neither is a prime, but they have no common factor except. The factorizations are 3x5 and 1x15; and 1 x 64 and 26, respectively.
As 13 is a prime number only itself and 1 are multiple. 13x1=13 and 13+1=14.
let's have two numbers a and b and a set of primes (pi) Suppose a = pa pa+1pa+2... and b = pb pb+1 pb+2... If at least one pi in both factorization is in common then the two numbers are not coprime (relatively prime), if none is in common then they are coprime
There are (99 - 9) = 90 2-digit numbers.13 of them are multiples of 7.The probability is 13/90 = 14.4% (rounded)