engineering recuitment NPCIL Plant Operator Mock Test Mathematics Matrices Adjoint and Inverse of a Square Matrix
If \(\rm A=\begin{bmatrix}1 & 0 & 2 \\ 5 & 1 & \rm x \\ 1 & 1 & 1 \end{bmatrix}\) is a singular matrix, then the value of x is equal to:
1
-11
2
11
3
9
4
-9