A senatorial candidate had planned to visit seven cities ...
A senatorial candidate had planned to visit seven cities prior to a primary election. However, he could only visit four of the cities. How many different itineraries could be considered?
640
840
520
920
Correct answer is B
Number of itineraries = 7P4
=7!(7−4)!=7!3!=7×6×5×4×3!3!=840
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