Answer: f is both one-one and onto.
- A f is one-one, but not necessarily onto
- B f is onto, but not necessarily one-one
- C f is both one-one and onto
- D f has an inverse defined somewhere in B
Correct answer: C. f is both one-one and onto
Explanation: Bijective = injective + surjective (one-one AND onto). Only then does an inverse function exist.
Concept context
Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.