Here is that set. (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) Choose whatever doesn't represent that.
Any set with fewer than or more than 20 distinct elements cannot represent the set of integers from 1 to 20.
The least common factor of any set of positive integers is 1.
The least common factor of any set of positive integers is 1.
This question is open to any number of answers. One such is the set {1,2,3,4,5,6,7,8,9,10,11} Another is {5,50,500,5000,...} Yet another is the set of irrational numbers, or the set of cats in the town of your choice. The list is endless, and meaningless.
The least common factor of any set of positive integers is 1.
The least common factor of any set of positive integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of numbers is 1.