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Q: What is the greatest common factor of two composite mumbers is 1?

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?

Not necessarily.

Yes.

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.

No.

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8 and 16

Not necessarily.

25 and 36

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Yes.

15 and 16

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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