Answer: in A or B or in both.
- A in A or B or in both
- B only in both A and B
- C in A but not in B
- D in neither A nor B
Correct answer: A. in A or B or in both
Explanation: A ∪ B contains every element belonging to A, to B, or to 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