Question

Which relation is NOT a function?
a.
{(0, 9), (2, 3), (3, 2), (4, 1)}
c.
{(0, 3), (2, 3), (3, 3), (4, 3)}
b.
{(3, 2), (4, 1), (0, 9), (3, 3)}
d.
{(0, 3), (3, 2), (2, 4), (4, 6)}

Answer 1

c)
{(0, 3), (2, 3), (3, 3), (4, 3)}