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Mathematics · 2025 · 2 marks
CBSE 2025 · Region 3 · Set 1 · Q22
The probability of guessing the correct answer of a certain test question is x/12. If the probability of not guessing the correct answer is 5/6, then…
The probability of guessing the correct answer of a certain test question is $\displaystyle \frac{x}{12}$. If the probability of not guessing the correct answer is $\displaystyle \frac{5}{6}$, then find the value of x.
Marking-scheme solution
\[\begin{aligned}
& \frac{x}{12}+\frac{5}{6}=1 \\
& x=2
\end{aligned}
\]
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CBSE Class 10 Mathematics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.