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Let be a function from (the set of positive integers) to (the set of rational numbers) defined by
and let be a function on defined by
We consider the statements provided in the different alternatives:
1. is not defined on the set of real numbers thus cannot be depicted as a straight line graph.
Only positive integers can be present in the domain of
It is the case that ordered pairs such as belong to and these pairs can be presented as dots in a graph.
2. We prove that is indeed injective:
3. The function is NOT surjective.
We conclude that is not surjective.
4. Since is not surjective, then is not bijective.
2. is injective.