The number of geometrical isomers possible in triamminetrinitrocobalt(III) is X and in trioxalatochromate(III) is Y. Then the value of X + Y is

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Strategy:
 Identify the complex representations, find their geometrical isomer counts, and sum them.

Step 1: Evaluate Triamminetrinitrocobalt(III)
Formula: . This is an octahedral  complex.
It exists as exactly two geometrical isomers: facial (fac) and meridional (mer).
X = 2.

Step 2: Evaluate Trioxalatochromate(III)
Formula: . This is an octahedral complex with three symmetrical bidentate ligands, type .
All positions are structurally equivalent regarding connectivity, so there are no disting

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