Which sets of ordered pairs represent functions from A to B? (Select all that apply.)

Question

A = {1, 2, 3, 4} and B = {−2, −1, 0, 1, 2}

Answer 1

choices
a. {(1, 1), (2, −2), (3, 0), (4, 2)}


b. {(1, 2), (4, 0), (2, 1)}


c. {(1, −1), (3, 2), (2, −2), (4, 0), (2, 1)}


d. {(1, 0), (2, 0), (3, 0), (4, 0)}

Answer 2

the key is that all the elements of A must be used exactly once.

Answer 3

First and last one.

Answer 4

a b