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It is: 12
The hcf of 60 and 72 is 12
6. 72/6=12 78/6=13
6. 42 = 2 x 3 x 7 18 = 2 x 32 72 = 23 x 32 hcf = 2 x 3 = 6
The HCF is: 2The LCM is: 2,520