Stage: 3 Challenge Level: 
You may like to download this word document which helps to explain the diagrammatic representation and provides blank diagrams and maps with no bridges for further investigation.
This lesson plan suggests how you could introduce this problem in the classroom.
Interactivities. Topology. Networks/Graph Theory. Working systematically. Creating expressions/formulae. Cubes. Mathematical reasoning & proof. Visualising. Mathematical modelling. Generalising.
Published October 2003.
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NRICH is part of the family of activities in the Millennium Mathematics Project, which also includes the Plus and Motivate sites.
email: nrich@damtp.cam.ac.uk