Answer: 5.
- A 3
- B 4
- C 5
- D 6
Correct answer: C. 5
Explanation: Equivalence relations on a 3-element set correspond to partitions. Partitions of {1,2,3}: {1},{2},{3} ; {1,2},{3} ; {1,3},{2} ; {2,3},{1} ; {1,2,3}. Total = 5.
Concept context
Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.