A. Fill-in the missing word by completing the given puzzle. A D is a well-defined collection of different objects such as numbers, people, letters of the alphabet, symbols, etc. A (2) is a set whose elements are members of another set. The (3) set contains all the elements being considered in each situation. A (4) set is an empty set which has no element. The (5) of set is the number of elements contained in a set.
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2. Subset
3. Universal set
4. Empty set
5. Cardinality