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Which of the following expression is correct for packing fraction of $NaCl$ if one face diagonal atoms are removed.

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\frac{\frac{16}{3} π r^{3} + \frac{13}{3} r^{3}}{8 {(r_{+} + r_{-})}^{3}}

None

$\frac{\frac{13}{3} π r^{3} + \frac{16}{3} r^{3}}{8 {(r_{+} + r_{-})}^{3}}$

\frac{\frac{13}{3} π r^{3} + \frac{4}{3} r^{3}}{8 {(r_{+} + r_{-})}^{3}}

answer is A.

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