CBSE 2026 · Region 2 · Set 1 · Q18 · 1 mark
For two events A and B such that $\displaystyle \mathrm{P}(\mathrm{A}) \neq 0$ and $\displaystyle \mathrm{P}(\mathrm{B}) \neq 1, \mathrm{P}\left(\mathrm{A}^{\prime} / \mathrm{B}^{\prime}\right)=$
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle \frac{1-\mathrm{P}(\mathrm{A} \cup \mathrm{B})}{\mathrm{P}\left(\mathrm{B}^{\prime}\right)}$
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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.