JEE Main 2018 — Permutation Combination Question with Solution
JEE Main 2018 (15 Apr Shift 1 Online)
Question
- digit numbers are formed using only three digits 2,5 and 7 . The smallest value of for which 900 such distinct numbers can be formed, is
Choose an option
Show full solutionCorrect option: D
Correct answer
D7
Step-by-step explanation
Required digit numbers is as each place can be filled by .
So smallest value of such that . Therefore .
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This is a previous-year question from JEE Main 2018, 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.