When an equimolar mixture of $C{u}_{2}S$ and $CuS$ is titrated with $Ba{\left(Mn{O}_4\right)}_2$ in acidic  medium, the final product contain $C{u}^{2+},S{O}_2\text{\hspace{0.17em}and\hspace{0.17em}}M{n}^{2+}$. If the molecular weight of $C{u}_{2}S,CuSandBa{\left(Mn{O}_4\right)}_2$   are $M_1,M_{2}and{M}_3$ respectively, then