The Locker Problem - The Math Doctors
https://www.themathdoctors.org/the-locker-problem27.01.2020 · A classic problem we’ve seen hundreds of times involves students opening and closing lockers. I have often told people that, believe it or not, they could find the answer by searching the Ask Dr. Math site for the word “locker”. But I prefer to give them a reference to one of the answers in which we gave only hints, because this is a fun problem to discover the …