Answer: 20.
- A 10
- B 20
- C 30
- D 40
Correct answer: B. 20
Explanation: Inclusion-exclusion principle: |A∪B| = |A|+|B|-|A∩B| = 60+40-20 = 80. Total surveyed = 100. Neither = 100-|A∪B| = 100-80 = 20. Answer: 20 people read neither
Concept context
Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.