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# The total number of tetrahedral voids in the face- centred unit cell

$\begin{array}{1 1} 6 \\ 8 \\ 10 \\ 12 \end{array}$

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the correct answer is 8 as

the number of tetrahedral voids are 2n in any crystal lattice

so the number of voids are 2(4)

as n=the number of atoms

thus the no of voids are 8