No.
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No. Let A = {a} (a singleton set) then P(A) = {a, 0} where 0 is the null (empty) set.
The set of people who answered this question before I did. There is only one empty set (a consequence of the Axiom of Extensionality). So the above answer is correct, and is equal to every other example.
It is an empty set.
Yes,an empty set is the subset of every set. The subset of an empty set is only an empty set itself.
The empty set is a set that has no elements.