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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. 81 is composite, 111 is prime.

Q: Is 81 and 111 co prime numbers?

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Yes.

1. The numbers are co-prime

The numbers are co-prime so the only common factor is 1.

Yes.

No - co-prime numbers are pairs of numbers which share no positive integer factors apart from 1. Twin prime numbers are a pair of prime numbers with a difference of 2.

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Yes.

1. The numbers are co-prime

The numbers are co-prime so the only common factor is 1.

If the question is about common factors, the answer is that these numbers are co-prime.

Yes.

No. Even numbers can't be co-prime.

A set of numbers whose GCF is one are called co-prime or relatively prime

No - co-prime numbers are pairs of numbers which share no positive integer factors apart from 1. Twin prime numbers are a pair of prime numbers with a difference of 2.

Two numbers are considered to be co-prime if they share no common prime factors, that is, if their GCF is 1.

Two numbers are co-prime if they do not have any common factors. The numbers themselves need not be prime.

Such numbers are relatively prime, or co-prime.

Sometimes.