somewhere I read gauss law states that electric flux passes through the surface is equal to the 1/ε times of the total enclosed charges in the entire volume.
and somewhere I read gauss law states that electric flux passes through the surface is equal to the total charges enclosed in the entire volume.
the difference between these two are is of 1/ε. how can these two be same?
Perhaps one of the authors uses a different unit system, like Gaussian instead of SI units. Have you checked that?
It is because of the units you choose in writing the formulas.
In SI units you have to use the extra 1/ε factor. The second statement you refer to is actually in something called a Gaussian system of units where charge is defined in units such that $\epsilon_0 = \frac{1}{4\pi c}$ and $\mu_0 = \frac{4\pi}{c} $ where c = speed of light.
Using these definitions one can show that there is no need for $\epsilon_0$ while expressing Gauss's law.
For example, while expressing Coulomb's law in a Gaussian system we only write $F=\frac{Q_1Q_2}{r^2}$ where Q is charge expressed in statocoulomb instead of the familiar SI coulomb.
