The three numbers that have a Greatest Common Factor (GCF) of 13 are any multiples of 13. This includes numbers like 13, 26, 39, 52, and so on. The GCF of these numbers is always 13 because it is the largest number that divides evenly into each of them.
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They are numbers of the form 13*p, 13*q and 13*r where p, q and r are any integers such that at least two of them are relatively prime.
You need at least two numbers to find a GCF and there can only be one GCF per set of numbers. Other than that...
13 and 26 26 and 39 13 and 39
The first two are prime so their hcf, and that of all three numbers, is 1.
The GCF of the given three numbers is 5
The GCF of the given three numbers is 7