Answer: n(A) + n(B).
- A n(A) + n(B)
- B n(A) − n(B)
- C n(A) × n(B)
- D 0
Correct answer: A. n(A) + n(B)
Explanation: With no overlap, the sizes simply add: n(A ∪ B) = n(A) + n(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