Let the relation R be defined on N by aRb if 2a + 3b = 30. Then which of the following belong(s) to R?

(3,8)

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(2,9)

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(9,4)

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(5,7)

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Solution

The correct option is C (9,4)
Relation R is defined on N by aRb if 2a + 3b = 30.
The pair (a,b) which satisfies equation 2a+3b=30 will belong to R.
(3,8) and (9,4) satisfy the above equation and hence belong to R.

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