Alice has 4 boxes, 327 blue balls, and 2022 red balls
Source: Canada Repêchage 2022/5 CMOQR
October 13, 2022
combinatorics
Problem Statement
Alice has four boxes, blue balls, and red balls. The blue balls are labeled to . Alice first puts each of the balls into a box, possibly leaving some boxes empty. Then, a random label between and (inclusive) is selected, Alice finds the box the ball with the label is in, and selects a random ball from that box. What is the maximum probability that she selects a red ball?