A relation defined as R = {(1, 2), (3, 4), (2, 4)} find R-1.

1
{Ø, (2, 1),  (4, 3),  (4, 2)}
2
{{Ø}, (2, 1),  (4, 3),  (4, 2)}
3
{(2, 1),  (4, 3),  (4, 2)}
4
None of these

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