Какие из следующих отношений являются функцией:
а) {(1, 3), (2, 3), (3, 5), (4, 6)}; d) {(7, 6), (5, 6), (3, 6), (-4, 6)};
b) (1, 3), (3, 2), (1, 7), (H1, 4)}; e) {(0, 0), (1, 0), (3, 0), (5, 0)};
c) {(2, -1), (2, 0), (2, 3), (2, 11)}; f) {(0, 0), (0, -2), (0, 2), (0, 4)}?​
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