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На множині A = {1,2,3,4,5,6,7} визначені відношення. Яке з них є функціональним?
{(1,1), (2,3), (3,4), (4,7), (5,2), (3,5), (7,6)}
{(3,1), (2,3), (1,5), (6,1), (4,3), (5,5), (7,7)}
{(3,1), (4,1), (5,3), (6,1), (7,3), (7,5)}
{(2,3), (1,5), (3,7), (4,7), (5,1), (6,2), (7,4), (5,6)}
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