In a binary compound, atoms of element \( \mathrm{A} \) form a hcp structure and those of elemen...

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In a binary compound, atoms of element \( \mathrm{A} \) form a hcp structure and those of element \( \mathrm{M} \) occupy \( 2 / 3 \) of the tetrahedral voids of the hcp structure. The formula of the binary compound is
(a) \( \mathrm{M}_{2} \mathrm{~A}_{3} \)
(b) \( \mathrm{M}_{4} \mathrm{~A}_{3} \)
(c) \( \mathrm{M}_{4} \mathrm{~A} \)
(d) \( \mathrm{MA}_{3} \)
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