You need at least two numbers to find a GCF.
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1 is the greatest common factor to these pair of numbers because no other number can evenly divide these 2.
You need at least two numbers to find a GCF. If that's 20, 36 and 72, the GCF is 4.
The greatest common factor of 21 and 77 is 7.
Greatest common factor of 33 and 77 is 11.
2 is the Greatest common factor.
1.
97