CBSE 2026 · Region 5 · Set 1 · Q18 · 1 mark
If $\displaystyle 3 \mathrm{P}(\mathrm{A})=\mathrm{P}(\mathrm{B})=\frac{3}{5}$ and $\displaystyle \mathrm{P}(\mathrm{A} \mid \mathrm{B})=\frac{2}{3}$, then $\displaystyle \mathrm{P}(\mathrm{A} \cup \mathrm{B})$ is :
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle \frac{2}{5}$
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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.