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87 = 3 x 29
In actual fact, the prime factorization of 42 is not 21 x 2, as 21 is not a prime number. The complete prime factorization of 42 is 2 x 3 x 7.
The prime factors of 87 are 3 x 29
3 , 29 & 87.
the LCM of 42 and 126 using a prime factorization is 2 times 2 times 3