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It is: 2 times 36 = 72
The factor pairs for 72 are these: (1, 72) (2, 36) (3, 24) (4, 18) (6, 12) (8, 9)
72 = 6*4*3
The GCF of the given numbers is 8
18 and 36 do. So do 18 and 54, 36 and 54, 18 and 72, 54 and 72, and an infinite number of other pairs of numbers.