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The French tricolor flag is made up of three vertical stripes: red, white, and blue. Suppose you are given four different colors of fabric and asked to create a different flag using the same tricolor design. If no two adjacent stripes can be the same color, how many different combinations of color patterns are there?
Question
#35911. Asked by RND. (Jul 05 03 3:12 PM)
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RND
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Roget is correct - it would be cool if he would explain how he got that number...
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Roget
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It is factorial 4, which is 4x3x2x1=24.
Another way is to think of the four colours, 1, 2, 3 and 4. If the left hand colour is 1 the possible combinations are 123, 124, 132, 134, 143 and 142. That's six possible combinations with 1 as the first colour. For each first colour there are 6 combinations, so 6x4=24.
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