On the set of positive rationals, a binary operation *is defined by \(\rm a * b = \dfrac{2ab}{5}.\)
If 2 * x = 3-1 then x =
1
\(\frac{1}{6}\)
2
\(\frac{5}{12}\)
3
\(\frac{2}{5}\)
4
\(\frac{125}{48}\)
On the set of positive rationals, a binary operation *is defined by \(\rm a * b = \dfrac{2ab}{5}.\)
If 2 * x = 3-1 then x =