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Які впорядковані пари належать бінарному відношенню U={(x, y): x+y=9} на множинах А={1, 3, 5, 7} і В={2, 4, 6}?
(6, 3), (4, 5), (2, 7)
(1, 6), (5, 4), (7, 2)
(3, 6), (5, 4), (7, 2)
(3, 6), (4, 4), (7, 2)
(3, 6), (5, 4), (2, 7)
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