Below you will see a rough plan of a river with an island and five bridges. On one side of the river is a monastery, and on the other side is a monk in the foreground.
Now, the monk has decided that he will cross every bridge once, and only once, on his return to the monastery.
This is, of course, quite easy to do, but on the way he thought to himself, 'I wonder how many different routes there are from which I might have selected.'
Could you have told him?
Send your solution by the end of the month to:
David Pleacher