Answer: One-one but not onto.
- A Bijective
- B Neither one-one nor onto
- C One-one but not onto
- D Onto but not one-one
Correct answer: C. One-one but not onto
Explanation: Distinct n give distinct 2n, but no odd natural number is in the range.
Concept context
Types of relations, equivalence classes, one-one and onto functions, composition, and invertible functions