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What is the smallest number of colours that must be used (including the light blue) to fill the regions so that no two adjacent

What is the smallest number of colours that must be used (including the light blue) to fill the regions so that no two adjacent regions are the same colour? Note: two regions are adjacent if they share a common border. you may use the light blue again . (A) 4 (B) 5 (C) 6 (D) 7

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