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The GCF is 4.
GCF of 152 and 140 is 4.
The GCF is 38.
The GCF is 1.
The GCF is 20.
The GCF is 19.
GCF of 140 and 25 is 5.
GCF of 64 and 152 is 8.64=1,2,4,8,16,32,64152=1,2,4,8,19,38,76,152
The GCF is 10.
The GCF is 2.