Which is/are correct statement? (a) In simple cubic close packed arrangement, no octahedral void...

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Which is/are correct statement?
(a) In simple cubic close packed arrangement, no octahedral void is present at edge centre.
(b) In fcc unit cell, octahedral void and tetrahedral void are vacant.
(c) Packing fraction: simple cubic unit cell \( \) bcc unit cell \( \) fcc unit cell
(d) Size of void : cubic void \( \) octahedral void \( \) tetrahedral void
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