33 isn't, but 3 is:
21 = 3 x 7
24 = 3 x 8
The only common (and hence greatest common) factor is 3 as there is no common factor (other than 1) between 7 and 8.
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The GCF is 3.
The greatest common factor (GCF) is: 6.
Greatest common factor of 6 24 and 33 is 3.
Greatest common factor of 24 48 and 84 is 4.
It is: 2