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In a row of five squares, each square is to be colored either red, yellow, or blue, so that no two consecutive squares have the same color, and at lest three of the squares are red.  How many ways are there to color the five squares?

 Sep 19, 2022
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If 3 squares are red, the 5 squares have to be R _ R _ R. 

 

Can you take it from here?

 Sep 19, 2022

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