2 x 3^2 x 7
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2 x 32 x 7
the LCM of 42 and 126 using a prime factorization is 2 times 2 times 3
It is: 126
As a product of its prime factors: 2*3*3*7 = 126 or as 2*32*7 = 126
The prime factors of 105 are 3, 5, and 7.The prime factors of 126 are 2, 3, 3, and 7.Therefore the prime factors that 105 and 126 have in common are 3, and 7.