A crystal is made of particles \( X, Y \) and \( Z . X \) forms fcc packing. \( Y \) occupies al...

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A crystal is made of particles \( X, Y \) and \( Z . X \) forms fcc packing. \( Y \) occupies all the octahedral voids of \( X \) and \( Z \) occupies all the tetrahedral voids of \( X \). If all the particles along one body diagonal are removed then the formula of the crystal would be:
(a) \( X Y Z_{2} \)
(b) \( X_{2} Y_{2} \)
(c) \( X_{8} Y_{4} Z_{5} \)
(d) \( X_{5} Y_{4} Z_{8} \)
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