There are not just three common multiples, but infinitely many. They are 168 and it multiples, so 1680 and 16800.
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The Least Common Multiple (LCM) for 6 7 12 is 84.
The Least Common Multiple (LCM) for 7 6 is 42.
THe Least Common Multiple (LCM) for 6 5 7 is 210.
The Least Common Multiple (LCM) for 6 7 is 42.
The Least Common Multiple of 6 and 7 is 42.