Teaching EMRS PGT Mock Test 2023 Mathematics Matrices Adjoint and Inverse of a Square Matrix

If A = \(\begin{bmatrix} 1& 0 \\ 1& 1 \end{bmatrix}\) then A-n will be equals to

1
\(\begin{bmatrix} 1& 0 \\ n& 1 \end{bmatrix}\)
2
\(\begin{bmatrix} 1& 0 \\ -n& -1 \end{bmatrix}\)
3
\(\begin{bmatrix} 1& 0 \\ -n& 1 \end{bmatrix}\)
4
None of these
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