Final answer:
The number of elements in set A is equal to the number of elements in the universal set U.
Step-by-step explanation:
The question is asking about the number of elements in set A when the universal set U is equal to set A. In this case, since set A is equal to the universal set U, it means that every element in U is also in A. Therefore, the number of elements in set A is equal to the number of elements in the universal set U.