I'm not sure that this is an algebra question.
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the set of every set is that set
null set or empty set, is a set with no elements.
The set contained in another set is termed as a sub-set.
A null set is a set that does not contain any elements, an empty set.
A null set is a set with nothing in it. A set containing a null set is still containing a "null set". Therefore it is right to say that the null set is not the same as a set containing only the null set.