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Given A = {11, 13, 15, 17} and B = {12, 14, 16, 18}, define a relation R from A to B by (x, y) in R if and only if x > y. List all ordered pairs in R.

1. {(13,12), (15,12), (15,14), (17,12), (17,14), (17,16)}
2. {(11,12), (13,14), (15,16), (17,18)}
3. {(13,12), (15,14), (17,16)}
4. {(11,12), (11,14), (13,12), (15,12)}

Correct answer: {(13,12), (15,12), (15,14), (17,12), (17,14), (17,16)}

Solution

Check each pair (x, y) and keep it only when x exceeds y.

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