27/3 = 9 and 51/3 = 17 so three is the greatest common factor (it's the only)
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3 is the greatest common factor of 21, 27, and 51The GCF is 3.
The greatest common factor is 51
What is the greatest common factor shared by 51 and 21?
Greatest common factor for 102 and 357 is 51.
Greatest common factor of 12 51 and 92 is 1.