What is the smallest number of colours that must be used (including the light blue) to...
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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 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 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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