Mathematics, 18.12.2021 14:00, decapria

Which relation is a function? {(1, 4), (2, 3), (3, 2), (4, 1)}

{(4, 2), (3, 3), (2, 4), (3, 2)}

{(1, −1), (−2, 2), (−1, 2), (1, −2)}

{(1, 2), (2, 3), (3, 2), (2, 1)}

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Which relation is a function? {(1, 4), (2, 3), (3, 2), (4, 1)}

{(4, 2), (3, 3), (2, 4...