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The GCF is 1.
' 1 ' is.
The GCF is 39.
The GCF of 39 & 14 is 1.
The GCF is 18.
The GCF is 70.
The GCF is 1
The GCF is: 13
The GCF is 3.
The GCF of 13, 39 is 13.