Question

Specify a codomain for each of the functions in Exercise 16. Under what conditions is each of these functions with the codomain you specified onto?

Short answer

1. No students are using same mobile phone number, not onto.
2. Every student get a unique identification number.
3. Every student got different final grades than other classmates.
4. Every student in the class are coming from different home towns.

Step-by-step solution

Step: 1

1. No students are using same mobile phone number, not onto.
2. Every students get a unique identification number.
3. Every students got different final grades than other classmates.
4. Every student in the class are coming from different home towns.