21, 42 find the LCM of the given number by prime factorization
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Alternatively, the lcm of 21 and 42 can be found using the prime factorization of 21 and 42: The prime factorization of 21 is: 3 x 7. The prime factorization of 42 is: 2 x 3 x 7. Eliminate the duplicate factors of the two lists, then multiply them once with the remaining factors of the lists to get lcm(21,21) = 42.
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