At very high pressures, the compressibility factor of one mole of a gas is given by :

Question

$\begin{array}{1 1}(1)\large\frac{pb}{RT} \\ (2) 1+ \large\frac{pb}{RT} \\ (3) 1- \large\frac{pb}{RT} \\ (4) 1- \large\frac{b}{(VRT)} \end{array}$