If that's 42, 63 and 84, the GCF is 21.
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The Greatest Common Factor (GCF) is: 1
The Greatest Common Factor (GCF) is: 6
the greatest common factor of 55 and 75 is 5
The Greatest Common Factor of 14 and 21 is 7.
the greatest common factor of 16 and 54 is 2