The common factors of 60, 105, and 165 are: 1, 3, 5, and 15
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60 = 2 * 2 * 3 * 5 105 = 3 * 5 * 7 Common Prime Factors: 3, 5
For 60, 2, 3 and 5 For 105, 3, 5 and 7
15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, . . .
The factors of 660 are 1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330, 660. For them to be common, they need to be compared to another set of factors. If that's 6 and 60, the common factors are 1, 2, 3 and 6.
The common factors of 42 and 60 are: 1, 2, 3, and 6