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42 is the LCM of 3, 6 and 7. All multiples of 42 are multiples of 3, 6 and 7
42 and 84
The least common multiple of the numbers 36 and 42 is 252.
The common multiples of 3 and 7 are 21, 42, 63 and so on.
Since the LCM is 12 then the common multiples are multiples of 12 12, 24, 36, 48