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Q: Common multiples of 2 and 7?

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The common multiples of 2 and 7 are 14, 28, 42, 56, 70, 84, 98, and so on.

14,28,42,56,70...

42

The first 2 multiples are 42,84.

lcm(2, 7) = 14 → first 3 common multiples are: 14, 28, 42; lcm(2, 8) = 8 → first 3 common multiples are: 8, 16, 24; lcm(7, 8) = 56 → first 3 common multiples are: 56, 112, 168; lcm(2, 7, 8) = 56 → first 3 common multiples are: 56, 112, 168.

2

28 and 56

Any multiple of 14.

28 and 56.

The common multiples of 7, 8, and 8 are the infinite set that includes any multiple of 56. The common multiples are thus 56, 112, 168, 224, 280, and so on.

The LCM is 42.

14, 28, 42

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