The Least Common Multiple (LCM) of 6, 7, and 21 is the smallest multiple that is divisible by all three numbers. To find the LCM, you need to factorize each number into its prime factors: 6 = 2 x 3, 7 = 7, and 21 = 3 x 7. Then, you take the highest power of each prime factor that appears in any of the factorizations: 2 x 3 x 7 = 42. Therefore, the LCM of 6, 7, and 21 is 42.
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The LCM is 105.
The LCM of 7 21 35 is 105
The LCM is 210.
Note that 21 x 2 = 42, so we really only need to look at 35 and 42. So 7 x 5 = 35, and 7 x 6 = 42. There is a common factor of 7. So we have 7 x 5 x 6 = 210 is the LCM.
LCM of 6, 7, and 14 = 42