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Option 4) is the wrong statement.
ABCABC... packing results in cubic close packing (CCP)
ABAB... type packing results in Hexagonal close packing (HCP)
ABCABC... and ABAB.... packing both give FCC Unit cell.
Packing Efficiency / Fraction for FCC is 74%
or 0.74, So Void fraction is 26% or 0.26.
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