Answer: A' ∩ B'.
- A A' ∪ B'
- B A' ∩ B'
- C A ∩ B
- D A' − B'
Correct answer: B. A' ∩ B'
Explanation: De Morgan first law: complement of union = intersection of complements. (A union B)' = A' intersect B'.
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