If the anions \( (A) \) form hexagonal closest packing and cations \( (C) \) occupy only \( 2 / ...

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If the anions \( (A) \) form hexagonal closest packing and cations \( (C) \) occupy only \( 2 / 3 \) octahedral voids in it, then the general formula of the compound is:
(a) \( C A \)
(b) \( \mathrm{CA}_{2} \)
(c) \( C_{2} A_{3} \)
(d) \( C_{3} A_{2} \)
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