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The GCF of a Prime number and a composite number is 1 if the former is not a factor of the latter.

73 is a prime number and 18 is a composite number and 73 is not a factor of 18 because 18 is not divisible by 73. So, GCF(73, 18) = 1.

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Q: What is the greatest common factor of 18 and 73?

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It is: 1

657

It is: 1

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