Question

A= $\left[\begin{array}{ccc}1&-2&0\\0&3&1\\1&1&0\end{array}\right]$
then determinant A.

Answer 1

$|A| = 1(3 \times 0 - 1 \times 1) - ( - 2)(0 - 1) + 0(0 - 3) \\ \\ |A| = - 1 - 2 + 0 \\ \\ |A| = - 3$