a) n = 1-[1/(6*(1-cosα)*( √(1-2cosα) )]
b) n = (1-cosα)*( √(1+2cosα) )
c) n = 1-[π/(6*(1-cosα)*(√(1-2cosα))]
d) n = 6*(1-cosα)*(√(1-2cosα))
Answer: c
Explanation: The formula was given by Slichter. In an intermediate packing, the centres of any 8 spheres, originally arranged in a cubic packing form the corners of the rhombohedron, with an acute face angle α.
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