Determine the values of X, Y, and Z for the following complexes and calculate the sum X + Y + Z.
X = Number of geometrical isomers of [Pt(NH3)(Cl)(Br)(Py)]
Y = Number of optically inactive isomers of [Cr(en)2Cl2]+
Z = Number of stereoisomers of [Co(NH3)3(NO3)3]