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Which of one of the following is the dom...

Which of one of the following is the domain of the relation R defined on the set `NN` of natural numbers are `R= {(m,n): 2m + 3n =30 ` where `m, n in NN}` ?

A

`{2,4,6,8}`

B

`{3,6,9,12}`

C

`{3,7,11,15}`

D

`{3,6,9,12,15}`

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The correct Answer is:
B
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