Answer: 9.
- A 9
- B 6
- C 8
- D 5
Correct answer: A. 9
Explanation: Each of the 2 inputs has 3 possible outputs, so the number of functions is 3² = 9.
Concept context
Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.