In a face centred cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cel — AITS & Test Series Chemistry Question

Question

In a face centred cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cell and B atoms are at the face centres. One of the A atom is missing from one corner in unit cell. The simplest formula of the compound is: (A) A7B3 (B) AB3 (C) A7B24 (D) A7/8B3