If A = 2, 4, 5, B = 5, 9, 11 and R is the relation from A to B such that a R b ⇔ b = 2a + 1 then the inverse relation of
From the definition, after simplifying, (5, 2), (9, 4), (11, 5) is left. The method is simple: formula → substitution → calculation → answer.
Ref: NCERT Mathematics Class XI — Sets, Relations and Functions
