The closest-packing sequence $A B A B . . . . .$ represents

primitive cubic packing

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body-centred cubic packing

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face-centred cubic packing

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hexagonal packing

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Solution

The correct option is C hexagonal packing
The closest-packing sequence ABAB..... represents hexagonal packing.
The closest-packing sequence AAAA..... represents primitive cubic packing.
The closest-packing sequence ABCABC..... (with spheres of third layer placed into octahedral voids) represents face-centred cubic packing.
The closest-packing sequence ABCABC..... (with spheres of third layer placed into tetrahedral voids) represents hexagonal packing.

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