Select the sets that are not functions.
A = {(1, 2), (2, 3), (3, 4), (4, 5)}
B = {(1, 2), (2, 1), (3, 0), (4, -1)}
C = [(-1, 3), (0, 3), (1, 3), (2, 3)}
D = {(1, 1), (1, 2), (1, 3), (1, 4);
E = {(6,2), (7,3), (6,-1), (5,4)}

A function is a relation in which every input has not more than one output.But the output of the inputs may be same.Here in D the input 1 has 4 different outputs as 1,2,3,4.So its not a function.Similarly in E 6 has 2 outputs as 2 and -1.For remaining sets the inputs has only one output.so they are functions.

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Select the sets that are not functions. A = {(1, 2), (2, 3), (3, 4), (4, 5)} B = {(1, 2), (2, 1), (3, 0), (4, -1)} C = [(-1, 3), (0, 3), (1, 3), (2, 3)} D = {(1, 1), (1, 2), (1, 3), (1, 4); E = {(6,2), (7,3), (6,-1), (5,4)}

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Select the sets that are not functions.
A = {(1, 2), (2, 3), (3, 4), (4, 5)}
B = {(1, 2), (2, 1), (3, 0), (4, -1)}
C = [(-1, 3), (0, 3), (1, 3), (2, 3)}
D = {(1, 1), (1, 2), (1, 3), (1, 4);
E = {(6,2), (7,3), (6,-1), (5,4)}