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The GCF is 6.
26 = 64, 2*3*14 = 114, 5*72 = 245So 1 must be the GCF of these three numbers
The GCF is 38.
The GCF is 2.
The GCF is 19.
The GCF is 72.
The GCF is 8.
The GCF is 1.