Mathematics - Determinant Question with Solution | TestHub

$l,m,n$ are the $p^{\text{th }},q^{\text{th }}$ and $r^{\text{th }}$ term of a G.P. all positive, then $\left|\begin{array}{ccc}\log l& p& 1\\ \log m& q& 1\\ \log n& r& 1\end{array}\right|$ equals