JEE Main 2013 — Probability Question with Solution
JEE Main 2013 (07 Apr)
Question
A multiple choice examination has questions. Each question has three alternative answers out of which exactly one is correct. The probability that a student will get or more correct answers just by guessing is :
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
or more correct answers means and wrong answers.
for wrong questions
for wrong questions
Hence favourable ways
Total ways of answering
Hence probability =
for wrong questions
for wrong questions
Hence favourable ways
Total ways of answering
Hence probability =
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This is a previous-year question from JEE Main 2013, 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.