Question

Which statement correctly describes an onto (surjective) function?

Options

• The function has no codomain.

• The function is necessarily self-inverse.

• Different inputs produce different outputs.

• Every element in the codomain has a corresponding input.

Answer 1

For an onto (surjective) function, every element in the codomain is the image of at least one input. Hence, every element in the codomain has a corresponding input.