$C=\left[ \begin{matrix}1 & 3 & 6 & 24 \\ \frac{1}{3} & 1 & 2 & 8 \\ \frac{1}{6} & \frac{1}{2} & 1 & 4 \\ \frac{1}{24} & \frac{1}{8} & \frac{1}{4} & 1 \\\end{matrix} \right]$
$\Rightarrow {{C}^{2}}=\left[ \begin{matrix} \frac{1}{3} & 1 & 2 & 8 \\ 1 & 3 & 6 & 24 \\ \frac{1}{6} & \frac{1}{2} & 1 & 4 \\ \frac{1}{24} & \frac{1}{8} & \frac{1}{4} & 1\\\end{matrix} \right]\left[ \begin{matrix} 1 & 3 & 6 & 24 \\ \frac{1}{3} & 1 & 2 & 8 \\ \frac{1}{6} & \frac{1}{2} & 1 & 4 \\ \frac{1}{24} & \frac{1}{8} & \frac{1}{4} & 1 \\\end{matrix} \right]$
$=\left[ \begin{matrix} 4 & {} & {} & {} \\ {} & 4 & {} & {} \\ {} & {} & 4 & {} \\ {} & {} & {} & 4 \\\end{matrix} \right]\Rightarrow {{C}^{2}}$ مجموع درایههای قطر اصلی $=16$