JEE Main 2020 — Permutation Combination Question with Solution
JEE Main 2020 (04 Sep Shift 2)
Question
A test consists of multiple choice questions, each having alternative answers of which only one is correct. The number of ways, in which a candidate answers all six questions such that exactly four of the answers are correct, is ___________
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Show full solutionCorrect answer: 135
Correct answer
135
Step-by-step explanation
No. of ways of giving wrong answer
So, required no. of ways
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This is a previous-year question from JEE Main 2020, covering the Permutation Combination 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.