Multiples of 5.
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80 has 5 factor pairs.
This question cannot be answered as all three numbers do not share a common factor. 2 has 2 as its only factor 5 has 5 as its only factor 10 has 2 and 5 as its factors. As you can see the three numbers do not contain a common factor, but 10 does have both the other numbers as factors.
5 is the only prime number in which 5 is a factor.
No. 15 and 5 share the factor 5.
5 is a prime factor of both numbers.