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840- 2 2 2 5 7 3840- 2 3rd power, *5*7*3840- 2*2*2*5*7*3
The LCM is: 840
The LCM of 20, 24, and 28 is 840
72 Divide by two. 36,2 Divide by two. 18,2,2 Divide by two. 9,2,2,2 Divide by three. 3,3,2,2,2 Stop. 2 x 2 x 2 x 3 x 3 = 72
The GCF is 40. The LCM is 6720. The GCD is infinite.