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(C) Let $\Delta = \left|\begin{array}{ccc}1 & \log _{x}y & \log _{x} z \ \log _{y} x & 1 & \log _{y} z \ \log _{z} x & \log _{z} y & 1\end{array}i

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(C) Let $\Delta = \left|\begin{array}{ccc}1 & \log _{x}y & \log _{x} z \ \log _{y} x & 1 & \log _{y} z \ \log _{z} x & \log _{z} y & 1\end{array}ight|$.Using the change of base formula $\log_{a}b = \frac{\log b}{\log a}$, we can rewrite the determinant as:$\Delta = \left|\begin{array}{ccc}\frac{\log x}{\log x} & \frac{\log y}{\log x} & \frac{\log z}{\log x} \ \frac{\log x}{\log y} & \frac{\log y}{\log y} & \frac{\log z}{\log y} \ \frac{\log x}{\log z} & \frac{\log y}{\log z} & \frac{\log z}{\log z}\end{array}ight|$.Now, take $\frac{1}{\log x}$ common from $R_{1}$, $\frac{1}{\log y}$ common from $R_{2}$, and $\frac{1}{\log z}$ common from $R_{3}$:$\Delta = \frac{1}{\log x \cdot \log y \cdot \log z} \left|\begin{array}{ccc}\log x & \log y & \log z \ \log x & \log y & \log z \ \log x & \log y & \log z\end{array}ight|$.Since all three rows are identical, the value of the determinant is $0$.

If $x, y$ and $z$ are greater than $1$, then the value of $\left|\begin{array}{ccc}1 & \log _{x} y & \log _{x} z \\ \log _{y} x & 1 & \log _{y} z \\ \log _{z} x & \log _{z} y & 1\end{array}\right|$ is

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