Note: Regions that meet only at a corner could be the same colour. Regions that are separated by a body of water are not adjacent.
EXTENSION (not mandatory) For students who would like an extra challenge -
b) Now consider a map of Europe. What is the fewest number of colours needed so that no two adjacent countries are the same colour? HINT - Start with the smallest countries (i.e., San Marino,
Vatican City, Liechtenstein, and Luxembourg).
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