What is the LCM of 18 30 and 42?

To find the Least Common Multiple (LCM) of 18, 30, and 42, we first need to find the prime factorization of each number.

18 = 2 * 3^2 30 = 2 * 3 * 5 42 = 2 * 3 * 7

Then, we take the highest power of each prime factor that appears in any of the numbers.

2^1 * 3^2 * 5^1 * 7^1 = 2 * 3^2 * 5 * 7 = 630

Therefore, the LCM of 18, 30, and 42 is 630.