If R = {(x, y): x = y} then which of the ordered pairs are correct? {(2, 3), (3, 2)} {(1, 2), (2, 1)} {(1, 1), (2, 2)} {1, -1), (2, -2)}

If R = {(x, y): x = y} then which of the ordered pairs are correct?

1.	If R = {(x, y): x = y} then which of the ordered pairs are correct? {(2, 3), (3, 2)} {(1, 2), (2, 1)} {(1, 1), (2, 2)} {1, -1), (2, -2)}
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