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Q 2686180077.     A substance `A_xB_y` crystallises in a face centred cubic (fcc) lattice in which atoms A occupy each corner of the cube and
atoms `B` occupy the centres of each face of the cube. Identity the correct composition of the substance `A_xB_y`'
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)