Fig. 5.8 3. Three unfriendly neighbours use the same water, oil and treacle wells. In order to avoid meeting, they wish to build non-crossing paths from each of their houses to each of the three wells. Can this be done? 4. Which complete graphs and complete bipartite graphs are planar? 5. For which values of r, s and t is the complete tripartite graph K planar? rst

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