CBSE 2026 · Region 5 · Set 3 · Q2 · 1 mark
A matrix $\displaystyle \mathrm{B}=\left[\mathrm{b}_{\mathrm{ij}}\right]_{\mathrm{m} \times \mathrm{m}}$ is said to be a diagonal matrix, if :
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle \mathrm{b}_{\mathrm{ij}}=0$, when $\displaystyle \mathrm{i} \neq \mathrm{j}$
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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.