Question

which of the following relations is not a function (0,5) (2,3) (5,8),(3,8)
(4,2) (-4,5) (0,0)
(6,5) (4,1) (-3,2) (4,2)
(-3,3) (2,1) (5,-2)
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Answer 1

The third one is not a function.

Because 4 appears twice in the range and it’s image is different each time.