Question

What is the total number of 4 digit numbers that can be formed using the digits 0, 1, 2, 3, 4, 5 without repetition, such that the number is divisible by 9?

Answer 1

We know that a number is divisible by 6 if it is: Even; Divisible by 3 (for which the sum of digits should be divisible by 3). Both of these ... So we can have either 0, 2 or 4 at units place.