15 students ask to visit a college admissions counselor. each visit includes one student. in how many ways can 10 time slots be assigned?

There are ten time slots for these appointments. For the first time slot, there are 15 different students that can fill the slot. Next appointment, there are only 14 possible students since we already saw one. This goes on and on, 15 x 14 x 13... for 10 different time slots. 

15 x 14 x 13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 = 10,897,286,400 


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The correct answer would be the fourth choice