#08 Prisoners locked up
There are 40 prisoners in Hallaway women’s prison, each in their own numbered cell, and 40 prison officers. All the cell doors are open and it is time to lock up for the night. Unfortunately, the prison officers have been drinking. Near the cells, there is a bucket containing the numbers 1 to 40 on pieces of paper.
Each prison officer in turn does the following: Picks a number from the bucket (and doesn’t put it back); turns the key in the cell of the number on her paper and of all cells that are multiples…
