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The GCF is 1.

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Q: What is the greatest common factor of 7 15 and 21?
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The Greatest Common Factor of 15, 21, 28: 1


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What is the greatest common factor of 15 21 and 27?

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What is the greatest common factor of 16 and 21?

The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.