Which relation is a function? {(1, 2); (2, 3); (3, 4); (1, 5)}

{(1, 2); (1, 3); (3, 2); (4, 2)}

{(1, 2); (2, 5); (3, 2); (4, 5)}

{(1, 2); (2, 3); (3, 4); (2, 5)}

the third relation: {(1, 2); (2, 5); (3, 2); (4, 5)}

Step-by-step explanation:

relations can only be a function if the input/x don't repeat at all.

its ok if the output/y repeat though!

hkhkhkhkhkhkhk

step-by-step explanation:

i am unable to solve this problem

step-by-step explanation: