Total volume of atoms present in face–centred cubic unit cell of metal is (r is atomic radius)
$\dfrac{24}{3}\pi r^3$
$\dfrac{12}{3}\pi r^3$
$\dfrac{16}{3}\pi r^3$
$\dfrac{20}{3}\pi r^3$
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In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3 rd of tetrahedral voids. The formula of the compound will be