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Calculate the void space in closest packing of `n` spheres of radius 1 unit, `n` spheres of radius `0.414` units, and `2n` spheres of radius `0.225` u

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Calculate the void space in closest packing of `n` spheres of radius 1 unit, `n` spheres of radius `0.414` units, and `2n` spheres of radius `0.225` units.
A. 19
B. 18
C. 91
D. 40
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Correct Answer - A
Since the packing is closest , therefore it is in fcc-type situation `Z_(eff)=4`/unit cell.
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