Which is/are correct statement? (a) Packing fraction in 2D-hcp is \( 0.785 \) (b) Packing fracti...

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Which is/are correct statement?
(a) Packing fraction in 2D-hcp is \( 0.785 \)
(b) Packing fraction in \( A A A . . . \). is \( 0.52 \)
(c) Packing fraction in \( A B A B \ldots . \). is \( 0.74 \)
(d) Void fraction in \( A B C A B C \)....... is \( 0.26 \)
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