Answer:
In
hcp lattice each third layer is parallel to first it is ABAB ...........type.
In ccp lattice each fourth layer is parallel to the first layer. It is ABCABC.........
type.
(a) For cubic hole r = 0.732 R
(b) For octahedral hole r = 0.414 R
(c) For tetrahedral hole r = 0.225 R.
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