14 and 21
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42 and 84
The least common multiple of 42 and 126 is 126.
21 and 6 are two composite numbers that have 42 as a common multiple. One of the prime factors of 42, which is 3, is a prime factor of 21 and 6 as well. The prime factorization of 42 (2 x 3 x 7) includes the prime factorization of 21 (3 x 7) and 6 (2 x 3).
14 and 21
The least common multiple of the numbers 36 and 42 is 252.