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4
The GCF is 2.
4 (4*3=12, 4*5=20)
4 3*4 = 12 5*4 = 20 6*4 = 24
The GCF is 4.
The GCF of 12, 20, and 36 is 4.The GCF is 4.
The GCF of 6, 12, and 20 is 2.
The GCF of 12 and 20 is 4.