$\begin{array}{1 1}M_2N_3,4\\M_3N_3,3\\MN_3,2\\M_2N_2,5\end{array} $

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Number of N ion in each fcc unit cell = 4

Number of tetrahedral voids =$4\times 2=8$

Fraction occupied by $(M^+)$ ions =$8\times \large\frac{1}{3}=\frac{8}{3}$

Ratio of N : M = 4 : $\large\frac{8}{3}$

$\Rightarrow 4\times \large\frac{3}{8}$

$N : M = 3 : 2= M_2N_3$

Coordination number of $M^+$ ion = 4

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