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Mathematics · 2025 · 1 mark
CBSE 2025 · Region 1 · Set 2 · Q11
If A = [-1, 0, 0; 0, 1, 0; 0, 0, 1], then A^-1 is
If $\displaystyle \mathrm{A}=\left[\begin{array}{ccc}-1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1\end{array}\right]$, then $\displaystyle \mathrm{A}^{-1}$ is
Official answer
(D)
$\displaystyle \left[\begin{array}{ccc}-1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1\end{array}\right]$
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CBSE Class 12 Mathematics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.