The number of 4-digit numbers that can be formed from digits 1,2,3,4,5 (repetition allowed) is $x$.
Answer (integer)
625
Solution
Each of the 4 positions has 5 choices (repetition allowed): 5⁴ = 625.
About this question
Subject: Mathematics · Chapter: Permutations and Combinations · Topic: Permutations
This question is part of PrepWiser's free JEE Main question bank. 16 more solved questions on Permutations and Combinations are available — start with the harder ones if your accuracy is >70%.