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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 4 · Set 3 · Q2
Let A =[ a_ij ] be a 2 × 2 matrix whose elements are given by a_ij =(( i +2 j )^2)/3. Then A^′ is given by:
Let $\displaystyle \mathrm{A}=\left[\mathrm{a}_{\mathrm{ij}}\right]$ be a $\displaystyle 2 \times 2$ matrix whose elements are given by $\displaystyle \mathrm{a}_{\mathrm{ij}}=\frac{(\mathrm{i}+2 \mathrm{j})^{2}}{3}$. Then $\displaystyle \mathrm{A}^{\prime}$ is given by :
Official answer
(D)
$\displaystyle \left[\begin{array}{cc}3 & \frac{16}{3} \\ \frac{25}{3} & 12\end{array}\right]$
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CBSE Class 12 Mathematics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.