In a C CP lattice of X and Y atoms are p...

In a `C CP` lattice of `X and Y` atoms are present at the corners while `Y` atoms are at face centeres .Then the formula of the compound would be if one of the atoms from a corner is replaced by `Z` atoms (also monovalent)?

`X_(7)Y_(24)Z_(2)`

`X_(7)Y_(24)Z`

`X_(24)Y_(7)Z`

`XY_(24)Z`

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