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14 June, 15:29

1). [ (2,1), (4,3), (6,5), (8,7) ] 2). [ (2,1), (4,1), (6,5), (8,7) 3). [ (2,1), (4,3), (6,5), (8,5) ] 4). [ (2,1), (4,3), (6,5), (2,7) ]. Which of the following is NOT a function?

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  1. 14 June, 17:01
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    there are two 2's in the input and if you plot them on the graph and use the vertical line test the line will go through more than one line which means it fails
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