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Mathematics 21 Online
OpenStudy (anonymous):

Permuation Problem Help! Determine the number of seven letter codes such that i) no letters are repeated in the code; and ii) letters a and b are not next to each other

OpenStudy (anonymous):

@satellite73 @jim_thompson5910 @Hero @Directrix @cwrw238 @robtobey @zepdrix @thomaster PLEASE HELP ME WITH THIS PROBLEM!

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