X is the number of geometrical isomers exhibited by [ Pt ( NH_3)( H_2 O ) BrCl ]. Y is the number of optically inactive isomer(s) exhibited by […

X is the number of geometrical isomers exhibited by $\displaystyle \left[\mathrm{Pt}\left(\mathrm{NH}_3\right)\left(\mathrm{H}_2 \mathrm{O}\right) \mathrm{BrCl}\right]$. Y is the number of optically inactive isomer(s) exhibited by $\displaystyle \left[\mathrm{CrCl}_2(\mathrm{ox})_2\right]^{3-}$ Z is the number of geometrical isomers exhibited by $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3\left(\mathrm{NO}_2\right)_3\right]$.The value of $\displaystyle \mathrm{X}+\mathrm{Y}+\mathrm{Z}$ is $\displaystyle \_\_\_\_$.