Q: What is the greatest common factor of 21 42 84?

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The common factors of 21 and 42 are 3, 7 and 21. The greatest common factor (GCF) is 21.

21 itself is the greatest common integral factor, since 21 X 2 = 42.

Since 21 is a factor of 42, it is automatically the GCF.

7 is the greatest common factor of 4942 and 21, or of 49, 42 and 21, if that is what you meant.

The GCF is 21.

It is: 21

The GCF (greatest common factor) would be 21.

3The GCF is: 2121.The GCF is 21.

21

21

21

The GCF is 21.