InterviewSolution
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whenfourlettersare insertedin tofourcovers (onein each ) A =eventthat onlyon lettersgoesto thepropercover . B = eventthat exactlythreelettersgo to thepropercovers . C=eventthat lllettersgo topropercoversand then ...... is true |
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Answer» <P>`p TOA , q to c, r to b` |
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