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Anonymous
The GCF is 1.
Wiki User
7 
1
7
The GCF is 7.
Just 1.
7, 14 and 21
7 and 14, among others.
7. 7x3=21 7x8=56
Since 28 is a factor of 84, it is automatically the GCF.
The GCF of 7 and 28 is 7.
There is only one common factor of 5, 3, 7: 1