JEE Main 2026 — Probability Question with Solution
JEE Main 2026 (08 April Shift 2)
Question
A candidate has to go to the examination centre to appear in an examination. The candidate uses only one means of transportation for the entire distance out of bus, scooter and car. The probabilities of the candidate going by bus, scooter and car, respectively, are , and . The probabilities that the candidate reaches late at the examination centre are , and if the candidate uses bus, scooter and car, respectively. Given that the candidate reached late at the examination centre, the probability that the candidate travelled by bus is:
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
Let , , and be the events that the candidate travels by bus, scooter, and car, respectively.
The probabilities of choosing these modes of transport are:
Let be the event that the candidate reaches the examination centre late. The conditional probabilities of reaching late are:
We need to find the probability that the candidate travelled by bus given that they reached late, which is .
Using Bayes' theorem:
Substituting the given values:
Taking the LCM of the denominators , , and , which is :
Answer:
The probabilities of choosing these modes of transport are:
Let be the event that the candidate reaches the examination centre late. The conditional probabilities of reaching late are:
We need to find the probability that the candidate travelled by bus given that they reached late, which is .
Using Bayes' theorem:
Substituting the given values:
Taking the LCM of the denominators , , and , which is :
Answer:
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This is a previous-year question from JEE Main 2026, covering the Probability chapter of Mathematics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.