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Let a R b the relation on the set N of a...

Let a R b the relation on the set N of all natural numbers defined by a+3b = 12. Find the obtain and range of R.

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R = {(3, 3), (6, 2), (9, 1)}
Domain of R = {3, 6, 9}
Range of R = {1, 2, 3}
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