Answer: A = B.
- A A = B
- B A ≠ B
- C A is empty
- D B is empty
Correct answer: A. A = B
Explanation: Mutual inclusion means the two sets have exactly the same elements, so A = 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