Q.

The arrangement ABC ABC ABC ..... is referred as

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a

Hexagonal close packing

b

Tetragonal close packing

c

Cubic close packing

d

Octahedral close packing

answer is A.

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Detailed Solution

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It represents C.C.P arrangement. 

In ABC   ABC  type of packing of spheres, the first three layers do not resemble each other but 4th, 5th and 6th layers resemble 1st, 2nd and 3rd layers respectively.

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The arrangement ABC ABC ABC ..... is referred as