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If the unit cell of a mineral has cubic close packed (ccp) array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction tetrahedral holes occupied by magnesium ions, m and n , respectively, are -

2 1 , 8 1
1, 4 1
2 1 , 2 1
4 1 ¸ 8 1

Correct answer: 2 1 , 8 1

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