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?
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✓
(3,2)
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×
(4,2)
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×
(2,3)
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×
(7,1)
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×
none of the above
Answer
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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.