State the domain of the following relation and state if it is a function.
(3, 2), (4, 1), (4, 5), (5, 1)

A.{3, 4, 5}; Yes
B.{1, 2, 5}; Yes
C.{3, 4, 5}; No
D.{1, 2, 5}; No

Respuesta :

2, 1, and 5 are the domain. It's not a function though because there are two 4's in the first place. I would say the answer is D.