Multiple Choice Question (MCQ)
If {(3,2),(4,2),(3,1),(7,1),(2,3)} is to be a function, which one of the following must be removed from the set?

✓
(3,2)

×
(4,2)

×
(2,3)

×
(7,1)

×
none of the above
If {(3,2),(4,2),(3,1),(7,1),(2,3)} is to be a function, which one of the following must be removed from the set?
(3,2)
(4,2)
(2,3)
(7,1)
none of the above
In a function, there can’t be two pairs with the same input. Therefore, either (3,2) or (3,1), which is not among the set of answer choices, must be removed so that input 3 will be paired with only one number.