Q: What is the least common multiple of 7 9 21?

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The least common multiple of 7, 21, 35 is:105

The Least Common Multiple (LCM) of (3,7) is 21.

105

It is: 42

21 = 7 x 3 , 9 = 3 x 3 ; for the Least Common Multiple (LCM), 21 already is a multiple of 7. 21 & 9 have a common factor of 3, so LCM = 21 x 3 = 63

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LCM: 21