In a certain school they're 100 lockers learning a long hallway the lockers are numbered 123 out of 100 all our clothes suppose a student 100 walked in the harness single file one after another suppose the first student opens every locking the second student comes along and closes every second locker beginning with locker number to long concert number three can change the position of every third locker if it is open if you didn't cause it if it is cause the student opened it she closes like a number three opens or six crazy soon