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Q: Which pairs of numbers have a least common multiple of 12?

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The product of all pairs of prime numbers is always the least common multiple of the two prime numbers.

Select ALL pairs of numbers that have a least common multiple of 30

24 and 48

Pick pairs of prime numbers. Pick any pairs of prime numbers.

The pairs that are relatively prime.

20 and 25

(21,5)(15,7)

They are: 2 and 9, 1 and 18

Pick any two numbers. All pairs of numbers have an LCM.

Two pairs of #'s with 10 as their least common multiple: 5x2 1x10

It means write down three pairs of numbers that are relatively prime like 4 and 9, 5 and 6, 13 and 25

How about: 2 3 4 and 6

15,4 10,60

12 and 10 15 and 4

4 and 9, 12 and 18

18 and 36, among others.

17 is the LCM of 1,17 and 17,17

3, 10

Any pair of prime or relatively prime numbers.

30 and 60 12 and 15

12 and 18 4 and 9

21 and 35 7 and 15

15 and 7 21 and 5

4 and 9 12 and 36

15 and 7 21 and 5