MathDB
Sheets and boxes

Source: Bulgaria JBMO TST 2017 P3 day 1

August 26, 2019
combinatorics proposedcombinatorics

Problem Statement

Given are sheets and the numbers 00,01,…,9900, 01, \ldots, 99 are written on them. We must put them in boxes 000,001,…,999000, 001, \ldots, 999 so that the number on the sheet is the number on the box with one digit erased. What is the minimum number of boxes we need in order to put all the sheets?
Back to ProblemsView on AoPS