n – digit numbers are formed using only three digits 2, 5 and 7. The smallest value of n for which 900 such distinct numbers can be formed, is

Question:

$n$ – digit numbers are formed using only three digits 2,5 and 7. The smallest value of $n$ for which 900 such distinct numbers can be formed, is

  1. 6

  2. 8

  3. 9

  4. 7

Correct Option: 4

JEE Main Previous Year 1 Question of JEE Main from Mathematics Permutations And Combinations chapter.
JEE Main Previous Year Online April 15, 2018

Solution:

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