The GCF is 1.
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The GCF is 5.
The GCF is 5.
The GCF is 5.
GCF(20, 25, 35, 40) = 5 The GCF of any set of numbers is also a factor of the difference of any pair of them. So the GCF must be a factor of 5 (= 25-20). This narrows down the options quite considerably!
20, 21, 22, 24, 25