Answer: Elements in A or B or both.
- A Elements present in A but not B
- B Elements present in both A and B simultaneously
- C Elements in A or B or both
- D Elements present in B but not A
Correct answer: C. Elements in A or B or both
Explanation: Union A union B contains all elements that are in A, in B, or in both.
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