Answer: 7.
- A 3
- B 4
- C 7
- D 12
Correct answer: C. 7
Explanation: Maximum of |A union B| is when A and B are disjoint: n(A) + n(B) = 3 + 4 = 7.
Concept context
Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.