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universal sets

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Distinguish : Null set and universal set

When we are using sets containing natural numbers,then N is the universal set.

When we are using sets containing natural numbers, then N is the universal set.

Prove the following : U -(U - A) = (A^(c))^(c)=A , where U is the universal set.

Which set can be the universal set for above sets?

Complement of the universal set U is a

Is the universal set unique ?

If A is universal set, then ((A')')' is_______

If I is a universal set, then write the complement of the set N.