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To repeat numbers in a set is redundant- it does not change the set since a set is determined by its members. Fir example {1,2,3} = {1,1,2,2,3,3 } . In the second case you are merely repeating yourself. You are saying "I am thinking of a set in which 1 is a member and 1 is a member and 2 is a member and 2 is a member and 3 is a member and 3 is a member." Repeating yourself does not change the set.
2 is the only member of both the set of all prime numbers and the set of all even numbers.
Negative numbers.
The extended set of natural numbers, or the non-negative integers.
The set of counting numbers greater than one.