Answer: 6.
- A 4
- B 6
- C 8
- D 3
Correct answer: B. 6
Explanation: Total functions from 3-element to 2-element set = 2³=8. Subtract non-onto (all map to just one element): 2 such constant functions. By inclusion-exclusion: onto = 8-2=6. Verify: each onto function covers both elements. Answer: 6 onto functions
Concept context
Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.