A crystal is made of particle a, b andc. A forms fcc packing b occupies all octahedral voids a and c occupies all tetrahedral void ofa. If all the particles along one body diagonal are removed them the formula of the crystal would be

A crystal is made of particle a, b andc. A forms fcc packing b occupie

1.	A crystal is made of particle a, b andc. A forms fcc packing b occupies all octahedral voids a and c occupies all tetrahedral void ofa. If all the particles along one body diagonal are removed them the formula of the crystal would be
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