Question

Overview,

Which of the following sets are functions?
a. {(1, 2), (2, 1), (3, 2), (1,4), (4, 2)}
b. {(1, 2), (2, 2), (3, 2), (4,2), (5, 2)}
c. {(1, 1), (1, 2), (1,3), (1, 4), (1,5)}
d. {(1, 1), (2, 2), (3, 3), (4, 4), (5,5)}
A. b and d
B. a, b, and c
C. b, c, and d
D. a, b, and d

Answer 1

A function cannot have multiple outputs with same inputs.
Given that, we know that a and c are not functions.

Solution: A. b and d