Number of formula units in unit cell of \( \mathrm{MgO} \) (rock salt), ZnS (zinc blende) and Pt...

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Number of formula units in unit cell of \( \mathrm{MgO} \) (rock salt), ZnS (zinc blende) and Pt (fcc) respectively
(1) \( 4,3,2 \)
(2) 4, 3, 4
(3) \( 4,4,4 \)
(4) \( 4,3,1 \)
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