CBSE 2023 · Region 5 · Set 2 · Q4 · 1 mark
If $\displaystyle \mathrm{A}=\left[\mathrm{a}_{\mathrm{i} \mathrm{j}}\right]$ is a square matrix of order $\displaystyle 2$ such that $\displaystyle \mathrm{a}_{\mathrm{ij}}=\left\{\begin{array}{ll}1, & \text { when } \mathrm{i} \neq \mathrm{j} \\ 0, & \text { when } \mathrm{i}=\mathrm{j}\end{array}\right.$, then $\displaystyle \mathrm{A}^{2}$ is
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle \left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]$
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CBSE Class 12 Mathematics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.