1611639 1611639 16-12-2020 Mathematics contestada Which of the following sets of ordered pairs is a function? A: (2,1),(2,2),(3.4),(5,6) B:(-2,-1),(1,2),(3,4),(1,5) C:(1,2),(2,2),(3,3),(2,4) D: (1,1),(2,1),(3,2),(4,4)