56.
Chat with our AI personalities
To find the Least Common Multiple (LCM) of 7, 14, and 21, we first need to factorize each number. The prime factors of 7 are 7, of 14 are 2 x 7, and of 21 are 3 x 7. To find the LCM, we take the highest power of each prime factor that appears in any of the numbers. Therefore, LCM(7, 14, 21) = 2 x 3 x 7 = 42.
The LCM is 112.
LCM(21, 28, 42) = 84
2 and 28, respectively.
LCM of 12 and 21 is 84, which is also a multiple of 28 so 84 is your answer.