X is the number of geometrical isomers exhibited by 
.
Y is the number of optically inactive isomer(s) exhibited by 
Z is the number of geometrical isomers exhibited by 
.
The value of 
is .
Text Solution
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(6)
For 
with square planar geometry and four different ligands, geometrical isomerism arises from different positional arrangements: 
.
For 
, the trans isomer is optically inactive (meso compound) while cis is optically active, giving Y 
.
For 
in octahedral geometry, facial (fac) and meridional (mer) isomers are possible: 
.
Therefore, 
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