CBSE 2023 · Region 4 · Set 1 · Q18 · 1 mark
The probability that A speaks the truth is $\displaystyle \frac{4}{5}$ and that of B speaking the truth is $\displaystyle \frac{3}{4}$. The probability that they contradict each other in stating the same fact is :
Official answer
From CBSE’s own marking scheme for this paper.
(A)
$\displaystyle \frac{7}{20}$
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CBSE Class 12 Mathematics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.