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Question


The relation R defined on the set of natural numbers as {(a, b) : a differs from b by 3}, is given by 


Options:
A .   {(1, 4, (2, 5), (3, 6),.....}
B .   {(4, 1), (5, 2), (6, 3),.....}
C .   {(1, 3), (2, 6), (3, 9),..}     
D .   None of these
Answer: Option B
:
B

R={(a,b):a,bN,ab=3}={((n+3),n):nN} 


={(4,1),(5,2),(6,3), .......} . 



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