`QQ^(+)` denote the set of all positive raional numbers. If the binary operation `@` on `QQ^(+)` is
Channel: Doubtnut
Date: 2020-05-09

`QQ^(+)` denote the set of all positive raional numbers. If the binary operation `@` on `QQ^(+)` is defined as `a@b=(ab)/(2)`, then the inverse of 3 is---