Question

Which relation is not a function? *
{(1 , -5),(2 , 4)(1 , -4)}
{(1 , -5),(2 , 4)(3 , -3)}
{(1 , -5),(2 , 4)(3 , 2)}
{(1 , -5),(2 , 4)(3 , -4)}

Answer 1

Answer:

First is not a function.