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

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A crystal is made of particles \( X \) and \( Y . X \) forms fcc packing and \( Y \) occupies all the octahedral voids. If all the particles along one body diagonal are removed then the formula of the crystal would be:
(a) \( X_{4} Y_{3} \)
(b) \( X_{5} Y_{4} \)
(c) \( X_{4} Y_{5} \)
(d) none of these
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