For fcc  if AB is just like the rock salt like structure then, A+ and B- are located at 

  1. A

    A+- Tetrahedral voids ; B- Corner 

  2. B

    A+- Corner and faces ;B- Octahedral voids 

  3. C

    A+- Octahedral voids ;B- Corner and faces 

  4. D

    A+ - Corner and faces : BOctahedral and tetrahedral voice 

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    Solution:

    AB is just like NaCl. Thus twelve A+ are at edges and 1 with in body of fcc i.e. in octahedral voids and six B- at faces and 8 at corner.

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