Q: Least common multiple of 3 and 5?

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The least common multiple of 3 and 5 is 15. This, however is not a multiple of 2 so we must find the next common multiple of 3 and 5. This is 30. Since 30 is also a multiple of 2, 30 is therefore the least common multiple of 3, 5 and 2.

The word "least" is a superlative. What that means is that there cam be only one such number. Therefore 2, 3 and 5 have only one least common multiple, not least common multiples! LCM(2, 3, 5) = 30.

The highest common multiple is infinite. The least (lowest) common multiple is 15.

60

The LCM of 3, 5, and 18 is 90

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The least multiple is 3. It is not the least COMMON multiple, but the question was not about common multiples.

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30The least common multiple of 3 and 5 would be 15. This is the least common non-zero multiple of the two numbers.It is: 15