In a face-centred cubic arrangement of $A$ and $B$ atoms,$A$ atoms are at the corners of the unit cell and $B$ atoms are at the face centres. If one of the $A$ atoms is missing from one corner of the unit cell,what is the simplest formula of the compound?
- A$A_{7} B_{24}$
- B$A_{7} B_{8}$
- C$A B_{3}$
- D$A_{7} B_{12}$
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