Which of the following sets of ordered pairs is a function? a) {(2,3) (3,4) (3,5) (5,6) }
b) {(1,5) (2,6) (3,7) (4,8) }
c) {(3,4) (5,7) (5,8) (7,9) }

How to do this , and can some one explain

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