Combinatorics · Counting · Divisibility rules · Digit problems
How many three-digit numbers written using the digits \(0, 1, 2, 3, 4, 5\) are divisible by \(15\), if
(a) all digits must be distinct? (b) digits may repeat?
Sign in to check answers, open hints, read the full solution, and track your progress. Statements are always free.
Serbian Municipal Competition 1998, high school grade I, problem 1. Organized by the Mathematical Society of Serbia (DMS). Source