Answer :

Given that, 2a + 3b = 30


3b = 30 - 2a



Since a,b N, ‘a’ must be a multiple of 3.


Substituting a = 3 in above equation we get,



for a = 3, b = 8


Similarly,


For a = 6, b = 6


For a = 9, b = 4


For a = 12,b = 2


Thus, R = {(3,8),(6,6),(9,4),(12,2)}


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