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Mathematics · 2024 · 1 mark
CBSE 2024 · Region 5 · Set 1 · Q4
If inverse of matrix [7, -3, -3; -1, 1, 0; -1, 0, 1] is the matrix [1, 3, 3; 1, λ, 3; 1, 3, 4], then value of λ is:
If inverse of matrix $\displaystyle \left[\begin{array}{ccc}7 & -3 & -3 \\ -1 & 1 & 0 \\ -1 & 0 & 1\end{array}\right]$ is the matrix $\displaystyle \left[\begin{array}{lll}1 & 3 & 3 \\ 1 & \lambda & 3 \\ 1 & 3 & 4\end{array}\right]$, then value of $\displaystyle \lambda$ is :
Official answer
(D)
$\displaystyle 4$
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CBSE Class 12 Mathematics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.