Answer: Elements in U but not in A.
- A A itself
- B Elements in A and U
- C Elements in U but not in A
- D Empty set
Correct answer: C. Elements in U but not in A
Explanation: A' = U minus A, i.e., all elements of the universal set U that are not in 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