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  4. In the set of positive real numbers, a * b=(a b/3), the inverse of 3 is

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Q. In the set of positive real numbers, $a * b=\frac{a b}{3}$, the inverse of $3$ is

KCETKCET 2022

Solution:

Here identity is $3 $
$ \therefore$ inverse of $3$ is $3$ itself.