Which of the following is the ratio of packing density of fcc, bcc ...

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Which of the following is the ratio of packing density of fcc, bcc and cubic structures?
(a) \( 0.92: 0.70: 1 \)
(b) \( 0.70: 0.92: 1 \)
(c) \( 1: 0.92: 0.70 \)
(d) \( 1: 0.70: 0.92 \)
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