Functions and Relations Question
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Which of the following IS NOT a relation?
- {(2, 3), (-1, 2), (1, 2), (2, 9)}
- {(-10, 10), (-1, 1), (1, 0), (2, -2)}
- {(9, 3), (1, -1), (1, 1), (4, 2)}
- All of the above are relations.
- None of the above are relations.