If a_1, a_2, a_3, , a_n, . are in G.P., then the value of the...

If $a_1, a_2, a_3, \ldots, a_n, \ldots$. are in G.P., then the value of the determinant \left|\begin{array}{ccc} \log a_n & \log a_{n+1} & \log a_{n+2} \\ \log a_{n+3} & \log a_{n+4} & \log a_{n+5} \\ \log a_{n+6} & \log a_{n+7} & \log a_{n+8} \end{array}\right| \text{, is }