If the binary operation `@` is defined on the set `QQ^(+)` of all positive rational numbers by `a@b=
Channel: Doubtnut
Date: 2020-05-09

If the binary operation `@` is defined on the set `QQ^(+)` of all positive rational numbers by `a@b=(ab)/(4)`. Then `3@((1)/(5)@(1)/(2))`  is equal to--