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Q: Lowest common multiples of 3 and 7?

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The LCM of 3 and 7 is 21.

The lowest common multiple is 42

The common multiples of an set of numbers are the multiples of their lowest common multiple. lcm(7, 8, 9) = 504 → the first 3 common multiples of 7, 8, 9 are 504, 1008, 1512.

1,7

It is: 42

42

35

455

56

There are infinitely many common multiples of 3, 5 and 7, each one 105 larger than the previous one. Or to put it another way: the common multiples of 3, 5 and 7 are the multiples of their lowest common multiple which is 105. ie their common multiples are all the multiples of 105, of which there is no end - there is an infinite number of multiples of 105 (or any other number [except zero]).

The LCM is: 14

They are infinite but the lowest common multiple is 84

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