Math

Which set of ordered pairs below is a function?
I.{(3 , 3), (6 , 1), (2 , 3)}
ll.{(4 , 7), (2 , 8), (4 , 2)}
lll. {(9 , 6), (3 , 1), (7 , 3)}

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  1. I. looks ok
    II. has 2 values of y for x = 4. NO way
    III. looks ok

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