Which of the following is not a function? – McqOptions

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1.	Which of the following is not a function?
A.	{(1,2), (2,4), (3,6)}
B.	{(-1,1), (-2,4), (2,4)}
C.	{(1,2), (1,4), (2,5), (3,8)}
D.	{(1,1), (2,2), (3,3)}
Answer» D. {(1,1), (2,2), (3,3)}

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