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Mathematics · 2023 · 1 mark
CBSE 2023 · Region 2 · Set 2 · Q8
If A and B are two events such that P ( A / B )=2 × P ( B / A ) and P ( A )+ P ( B )=2/3, then P ( B ) is equal to
If A and B are two events such that $\displaystyle \mathrm{P}(\mathrm{A} / \mathrm{B})=2 \times \mathrm{P}(\mathrm{B} / \mathrm{A})$ and $\displaystyle \mathrm{P}(\mathrm{A})+\mathrm{P}(\mathrm{B})=\frac{2}{3}$, then $\displaystyle \mathrm{P}(\mathrm{B})$ is equal to
Official answer
(A)
$\displaystyle \frac{2}{9}$
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CBSE Class 12 Mathematics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.