Those are the factors of 28. For them to be common, they need to be compared to another set of factors.
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14 can never be the least common factor of two numbers. The least common factor of any two numbers is 1.
The common factors are 1, 2, 4, 7, 14, 28.
1, 2, 7 and 14 are the common factors of 28 and 42. Since all of the numbers are common factors, we will not be able to select two.
Two numbers that have an LCM of 28 are 14 and 28.
The greatest common factor of 28 and 42 is 7