Stage: 5 Challenge Level: 
These are the nets of 4 cubes. Build a tower so that on each vertical wall no colour is repeated, that is all 4 colours appear.
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Making and proving conjectures. Learning through exploration. Mathematical reasoning & proof. Games. Networks/Graph Theory. Factors and multiples. Combinatorics. Interactivities. Visualising. Working systematically.
Published November 2002,December 2002,March 2009.
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email: nrich@damtp.cam.ac.uk
