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Anonymous
' 1 ' is the only common factor of those numbers.
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The GCF is 1.
The GCF of 4 and 7 is 1. The GCF of 11 and 44 is 11. The GCF of 4, 7, 11 and 44 is 1.
GCF(4, 7, 9) = 1.