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Нехай є множина A = {1, 2, 3}. Яке з наступних відношень на множині A не є функцією?
{(1, 2), (2, 3), (3, 1)}
{(1, 2), (2, 1), (3, 1)}
{(1, 2), (2, 1), (3, 3)}
{(1, 1), (2, 2), (3, 1), (3, 2)}
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