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Mathematics 20 Online
OpenStudy (anonymous):

The sequence Z, W, Y, X may be changed in either of two ways. Either two adjacent letters may be interchanged or the entire sequence may be reversed. What is the least number of such changes needed to put the letters into alphabetical order from left to right?

OpenStudy (radar):

|dw:1374865035837:dw|

OpenStudy (radar):

|dw:1374865147280:dw|

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