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[" 57.A mineral having the formula "AB(2...

[" 57.A mineral having the formula "AB_(2)" ,crystallises in "],[" the cubic close - packed lattice,with the A atoms "],[" occupying the lattice points.The co ordination "],[" number of the A atoms is "x," that of "B" atoms is y."],[" Report your answer "(x-y).quad x=8;y=4]

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