Answer: cardinality.
- A cardinality
- B ordered pair
- C power
- D index
Correct answer: A. cardinality
Explanation: The cardinality n(A) is the count of elements in the set A.
A Venn diagram makes set identities visual: A∪B is everything inside either circle, A∩B is only the overlap, and the region outside both circles represents the complement of their union - directly illustrating De Morgan's law (A∪B)′ = A′∩B′.
Concept context
Types of sets, operations (union/intersection/complement), relations, and types of functions with domain and range