Answer: 16.
- A 10
- B 16
- C 20
- D 26
Correct answer: B. 16
Explanation: C(5,3) + C(5,4) + C(5,5) = 10 + 5 + 1 = 16.
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