Which of the following tables represents a function?

Answer:
The third table
Step-by-step explanation:
It's the third table because each input does not repeat, so it means all of the inputs are unique
Repeating inputs (x) make it not a function
As their is no mention of test assuming it's not a test question
Solution
Now
As per definition of function
Thing we have to see here is x values must not repeated more than once
In table 3
Table 3 is a function