Henry Ernest Dudeney/Puzzles and Curious Problems/287 - The Handcuffed Prisoners

by : $287$

 * The Handcuffed Prisoners
 * Nine dangerous convicts needed to be guarded.
 * Every day except Sunday they were taken out for exercise, handcuffed together in groups of three, as in the diagram:


 * Dudeney-Puzzles-and-Curious-Problems-287.png


 * On no day in any one week were the same two men to be handcuffed together.
 * If will be seen how they were sent out on Monday.
 * Can you arrange the nine men in triplets for the remaining $5$ days?


 * It will be seen that No. $1$ cannot be handcuffed to No. $2$ again, but $1$ and $3$ can subsequently be so.

Also see

 * Fifteen Schoolgirls Puzzle, of which this is a relative