CBSE 2026 · Region 4 · Set 1 · Q19 · 1 mark
Assertion (A) : If A and B are two square matrices such that AB and BA are defined, then it is not necessary that $\displaystyle \mathrm{AB}=\mathrm{BA}$.
Reason (R): Product of two diagonal matrices of same order is commutative.
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
MatricesOperations on MatricesUnderstandassertion_reasonmedium
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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.