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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 4 · Set 1 · Q19
Assertion (A): If A and B are two square matrices such that AB and BA are defined, then it is not necessary that AB = BA. Reason (R): Product of two…
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
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
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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.