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Mathematics · 2023 · 1 mark
CBSE 2023 · Region 2 · Set 1 · Q3
If [1, 2, 1; 2, 3, 1; 3, a, 1] is non-singular matrix and a ∈ A, then the set A is
If $\displaystyle \left[\begin{array}{lll}1 & 2 & 1 \\ 2 & 3 & 1 \\ 3 & \mathrm{a} & 1\end{array}\right]$ is non-singular matrix and $\displaystyle \mathrm{a} \in \mathrm{A}$, then the set A is
Official answer
(D)
$\displaystyle \mathbb{R}-\{4\}$
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CBSE Class 12 Mathematics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.