Question

The relation R is defined on the set of natural numbers as {(a,b) : a = 2b}. Then $R^{-1}$ is given by

• A. {(2, 1), (4, 2), (6, 3).....}
• B. {(1, 2), (2, 4), (3, 6)....}
• C. $R^{-1}$ is not defined
• D. None of these

Answer 1

The correct option is B

{(1, 2), (2, 4), (3, 6)....}

R = {(2,1),(4,2),(6,3),.....}.

So, $R^{-1}$ = {(1,2),(2,4),(3,6),......}.