1. Tardigrade
  2. Question
  3. Mathematics
  4. Number of 4-digit numbers (the repeation of digits is allowed) which are made using the digits 1,2 , 3 and 5 , and are divisible by 15 , is equal to

Q. Number of 4-digit numbers (the repeation of digits is allowed) which are made using the digits 1,2 , 3 and 5 , and are divisible by 15 , is equal to _____

 377  128 JEE MainJEE Main 2023Permutations and Combinations Report Error

Answer: 21

Solution:

For number to be divisible by 15, last digit should be 5 and sum of digits must be divisible by 3.

Solution Image