What is the percentage of unoccupied space in $fcc$ unit cell (in $\%$)?
- A$74$
- B$26$
- C$68$
- D$32$
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In a binary compound,atoms of element $A$ form a $hcp$ structure and those of element $M$ occupy $2/3$ of the tetrahedral voids of the $hcp$ structure. The formula of the binary compound is
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