MathDB
300 people in a circle, last person standing wins

Source: II Soros Olympiad 1995-96 R1 9.7 https://artofproblemsolving.com/community/c2416727_soros_olympiad_in_mathematics

June 2, 2024
combinatoricsnumber theory

Problem Statement

300300 people took part in the drawing for the main prize of the television lottery. They lined up in a circle, then, starting with someone who received number 11, they began to count them. Moreover, every third person dropped out every time. (So, in the first round, everyone with numbers divisible by 33 dropped out). The counting continued until there was only one person left. (It is clear that more than one circle was made). This person received the main prize. (It “accidentally” turned out to be the TV director’s mother-in-law). What number did this person have in the initial lineup?