Question

Below are words which can be associated with one-to-one functions. Write a

statement below that may prove it is an example of one-to-one function.

Example: Passport ID

Answer: A person has only one passport ID.

1. Citizenship

2. Fare

3. Car

4. Area of a circle.

5. Soap

thanks.​

Answer 1

Answer:

Citizenship is the answer.