A transition Metal M can exist in two oxidation states +2 and +3.It forms an oxide whose experimentalformula is given by MxO where x < 1. Then the ratio of metal ions in +3 state to those in +2 state in oxide is given by :

(1) $\frac{1-x}{1+x}$

(2) 1 + 2X

(3) 1 + $\frac{x}{2}$

(4) $\frac{2(x-1)}{3x-2}$