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.
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The objects within a number set can be caled as "Elements" or "members".
It depends on the set of numbers that you have and where, within that set, you start.
The mode is the number that appears most often in any given set. If none of the numbers are repeated, there is no mode.
If numbers may be repeated . . . 36 If numbers may not be repeated . . . 30 If the sequence doesn't matter . . . 15
Those are called the elements of the set.