Answer: Empty set.
- A Singleton set
- B Empty set
- C Universal set
- D Infinite set
Correct answer: B. Empty set
Explanation: An empty set (or null set) has no elements and is denoted by {} or the symbol phi.
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