Find determinant of following matrix:
## A = \begin{pmatrix}
a_{1,1} & a_{1,2} & \cdots & a_{1,n-1} & a_{1,n} \\
a_{2,1} & a_{2,2} & \cdots & a_{2,n-1} & 0 \\
\vdots & \vdots & \ddots & \vdots & \vdots \\
a_{n,1} & 0 & \cdots & 0 & 0
\end{pmatrix} ##
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