Calculate the void space in closest packing of a spheres of radius 1 unit, \( \mathrm{n} \) sphe...

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Calculate the void space in closest packing of a spheres of radius 1 unit, \( \mathrm{n} \) spheres of radius 0.414 units and \( 2 \mathrm{n} \) spheres of radius 0.225 units.
(a) \( 19 \% \)
(b) \( 81 \% \)
(c) \( 74 \% \)
(d) \( 26 \% \)
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