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There are 10 desks in a classroom. A teacher sets up a seating chart for the 10 students in his class. What is the probability that when the students come in on the first day and randomly sit down, that each student will be in the correct seat?
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only one arrangement is corrected and if they randomly sit down, there are 10! kinds of arrangements. so probability is 1/10!=1/(10*9*8*7*6*5*4*3*2*1)
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