You could use -12 and -1 or -16 and 3.
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Well, honey, the common factors of 13 and 26 are 1 and 13. That's it, plain and simple. Not much to work with there, but hey, at least you got your answer.
The GCF of 143 and 169 is 13. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 143 are 1, 11, 13, and 143. The factors of 169 are 1, 13, and 169. The common factors are 1 and 13. Therefore, the greatest common factor is 13.
13 and 19 share no common factors aside from 1.
11 and 13 share no common factors aside from 1.
The factors of 39 are 1, 3, 13, and 39. The factors of 65 are 1, 5, 13, and 65. The common factors are 1 and 13.