Mathematics

Problem

a_1, a_2, a_3, \dots, a_n, \dots

are in GP, then the determinant

\Delta = \begin{vmatrix} \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{vmatrix}

is equal to a. 1 b. 0 c. 4 d. 2