If the unit cell of a mineral has cubic close packed (ccp) \( \mathrm{P} \) array of oxygen atom...

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If the unit cell of a mineral has cubic close packed (ccp)
\( \mathrm{P} \) array of oxygen atoms with \( \mathrm{m} \) fraction of octahedral

W. holes occupied by aluminium ions and \( \mathrm{n} \) fraction of tetrahedral holes occupied by magnesium ions, \( \mathrm{m} \) and \( \mathrm{n} \), respectively, are
[JEEAdvanced-2015]
(A) \( \frac{1}{2}, \frac{1}{8} \).
(B) \( 1, \frac{1}{4} \)
(C) \( \frac{1}{2}, \frac{1}{2} \)
(D) \( \frac{1}{4}, \frac{1}{8} \)
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