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On the set of natural numbers N, define the relation R = {(a, b): a + b = 5, b > 1}. Which ordered pair belongs to R?

1. (2, 3)
2. (4, 2)
3. (2, 1)
4. (4, 1)

Correct answer: (2, 3)

Solution

Only (2,3) satisfies both a + b = 5 and b > 1.

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