The GCF is 1.
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The Greatest Common Factor of 21, 63, 84: 21
Greatest common factor for 35 and 63 and 84 is 7.
The greatest common factor of 63, 84, and 105 is 21.
Since 7 is a factor of 63, it is automatically the GCF.
The greatest common factor of 89 and 33 is 1.