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21. Combinatorics/Counting Methods
22. Probability
! 
Please post PS questions in the PS subforum: gmatproblemsolvingps140/ Please post DS questions in the DS subforum: gmatdatasufficiencyds141/ No posting of PS/DS questions is allowed in the main Math forum. 
"There are three secretaries who work for four departments. If each of the four departments has one report to be typed out, and the reports are randomly assigned to a secretary, what is the probability that all three secretaries are assigned at least one report? " 

