CBSE 2026 · Region 5 · Set 1 · Q1 · 1 mark
If matrix $\displaystyle \mathrm{A}=\left[\begin{array}{rr}-\mathrm{p} & \mathrm{q} \\ \mathrm{r} & \mathrm{p}\end{array}\right]$ is such that $\displaystyle \mathrm{A}^{2}=\mathrm{I}$, then :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle 1-\mathrm{p}^{2}-\mathrm{qr}=0$
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CBSE Class 12 Mathematics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.