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Q: Why 1 is not a co-prime number?

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Because one is a common factor of every number.

There is no such thing as a coprime number.Two integers are said to be relatively prime (or coprime) if they have no common positive factor, other than 1. Examples:Any two different prime numbers are coprime.16 and 27 are coprime.14 and 18 are not coprime. They have the common factor 2.

Coprime numbers are those in which only 1 and that number (say 5) can be divisible by it. Both 5 and 7 would be coprime numbers because they are numbers divisible by only themselves and 1.

Only 1. The two are coprime.

1, the numbers are coprime

1. The two numbers are coprime.

1. The two numbers are coprime.

The two numbers are coprime, so the answer is 1.

Only 1: the two numbers are coprime.

GCF(16, 77) = 1; they are coprime.

1. The two numbers are coprime.

Only 1. The two numbers are coprime.

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