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Yes GCF can be 1 because if it doesn't have any other common factors than it's one
The GCF is 1.
The GCF of 4 and 10 is 2.
The GCF is 2.
GCF(1, 5, 10) = 1. The GCF of any set of numbers containing 1 must be 1.
The GCF is: 1