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The greatest common factor of a Prime number & a composite number is 1 if the composite number is not divisible by the prime number.

81(composite number) is not divisible by 29(prime number) so, gcf(29,81) = 1.

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Factors of 29: 1, 29

Factors of 85: 1, 5, 17, 85

GCF (29, 85) = 1

The common factors of 29 are: 1, and 29.

The common factors of 73 are: 1, and 73.

They are both prime numbers so the greatest common factor is 1.

Q: What is the greatest common factor of 29 and 73?

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The GCF is 1.

The GCF is 1.

The GCF is 1.

The GCF is 1.

The GCF is 1.

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The GCF is 1.

The GCF is 1.

The GCF is 1.