CBSE 2024 · Region 4 · Set 3 · Q5 · 1 mark
Let $\displaystyle \mathrm{A}=\left[\begin{array}{ccc}1 & -1 & 2 \\ 0 & 2 & -3 \\ 3 & -2 & 4\end{array}\right]$ and $\displaystyle \mathrm{B}=\frac{1}{3}\left[\begin{array}{ccc}-2 & 0 & 1 \\ 9 & 2 & -3 \\ 6 & 1 & \lambda\end{array}\right]$. If $\displaystyle \mathrm{AB}=\mathrm{I}$, then the value of $\displaystyle \lambda$ is :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle -2$
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CBSE Class 12 Mathematics past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.