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Select all the relations which represent a function.
- (1,3), (2,5), (2,7), (4,9) (1,3), (1,5), (1,7), (4,9) 0 (1,2), (2,5), (2,1), (4,5)
(1,3), (2,5), (3,7), (4,9) (1,3), (2,3), (3,3), (4,3)

Select all the relations which represent a function 13 25 27 49 13 15 17 49 0 12 25 21 45 13 25 37 49 13 23 33 43 class=

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