42 has 8 factors: 1 2 3 6 7 14 21 42.
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1344 is a multiple of 42. 42 is a factor of 1344. Factors go into numbers, numbers go into multiples.
1 and 2 are factors common to both numbers
1, 2, 7 and 14 are the common factors of 28 and 42. Since all of the numbers are common factors, we will not be able to select two.
The prime factors of 42 are 2, 3 and 7.
The common factors of 6, 42, and 84 are numbers that can evenly divide all three of these numbers. The factors of 6 are 1, 2, 3, and 6. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84. Therefore, the common factors of 6, 42, and 84 are 1, 2, 3, 6, and 42.