Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Engineering Mathematics Linear Algebra Matrix Algebra
If \(A=\left[\begin{array}{rrr}1 & 2 & -2 \\ -1 & 3 & 0 \\ 0 & 2 & 1\end{array}\right]\), then A-1 is
1
\(\left[\begin{array}{lll} 3 & 2 & 1 \\ 1 & 1 & 2 \\ 1 & 1 & 5 \end{array}\right]\)
2
\(\left[\begin{array}{lll} 3 & 2 & 6 \\ 1 & 1 & 2 \\ 2 & 2 & 5 \end{array}\right]\)
3
\(\left[\begin{array}{lll} 3 & 2 & 6 \\ 1 & 1 & 0 \\ 2 & 0 & 5 \end{array}\right]\)
4
More than one of the above
5
None of the above