None. The LCM (least common multiple) is the smallest positive whole number exactly divisible by two or more given whole numbers. So, there is no LCM of 42 which is a single number...
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The LCM of 3 and 42 is 42.
LCM(14, 42) = 42
The LCM of 18 and 42 is 126.126
LCM = product/HCF; HCF is 6 so LCM = 12 x 42 = 504
The LCM is: 4,704