CBSE 2025 · Region 3 · Set 1 · Q22 · 2 marks
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
\[\begin{aligned}
& \frac{x}{12}+\frac{5}{6}=1 \\
& x=2
\end{aligned}
\]
ProbabilityComplementary EventsApplyvery_short_answereasy
More from Probability
- The number of red balls in a bag is 10 more than the number of black balls. If the probability of drawing a…2025 · asked 3×
- Rahul is a lucky charm for his cricket team. He has a jar of cards with numbers from 10 to 74. Before each…2025 · asked 3×
- Two coins are tossed simultaneously. The probability of getting atleast one head is2025 · asked 3×
- Assertion: The probability of selecting a number at random from the numbers 1 to 20 is 1. Reason (R): For any…2025 · asked 3×
- In an experiment of throwing a die, Assertion: Event E 1: getting a number less than 3 and Event E 2: getting…2025 · asked 3×
- A card is selected at random from a deck of 52 playing cards. The probability of it being a red face card is:2025 · asked 2×
- A die is thrown once. The probability of getting a number which is not a factor of 36, is:2025 · asked 2×
- Two dice are thrown at the same time. Determine the probability that the difference of the numbers on the two…2025 · asked 2×
CBSE Class 10 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.