The complement of a set "A" is another set - call it "B" - that contains all the elements (of the universe under consideration) which are NOT in set "A". The "universe" must be specified (or implied), since concepts like the "set of all sets" are known to cause contradictions. For example, if the universe is all the people living in my country, and set "A" is all male people, then the "complement" would be the female people.
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The complement of a set S, relative to the universal set U, consists of all elements of U that are not in S.
The answer depends on what the set UR is!
The complement of an event occurring is that it does not occur.
Yes.
they are not the same elements.