Aside from the obvious 39 & 1, 3 x 13 = 39.
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The factors of 39 are 1, 3, 13 and 39. For them to be common, they need to be compared to another set of factors.
The factors of 39 are: 1, 3, 13, 39 The factors of 78 are: 1, 2, 3, 6, 13, 26, 39, 78
Since 13 is a factor of 39, all of its factors are common.
4u2 - 6u - 39 does not have rational factors.
The common factors of 13 and 39 are: 1 and 13
The factors of 39 are: 1, 3, 13, and 39.The prime factors of 39 are: 3 and 13.The factors of 50 are: 1, 2, 5, 10, 25, and 50.The prime factors of 50 are: 2 and 5.