Which of the following sets of ordered pairs defines a relation?
a.{(3,2),(-3,6),(3,-2),(-3,-6)}
b.{(1,2),(2,6),(3,2),(4,-6)
c.{(2,2),(2,3),(2,4),(2,-9)}
d.all of the above
a.{(3,2),(-3,6),(3,-2),(-3,-6)}
b.{(1,2),(2,6),(3,2),(4,-6)
c.{(2,2),(2,3),(2,4),(2,-9)}
d.all of the above
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