Mathematics, 19.07.2019 21:00 angelaOR
How many different ways can the front row seats be filled with 20 students if the classroom has 4 rows of seats? 1,860,480 116,280 4,845?
Answers: 2
![C=20!/[(20-4)!*4!]\\ C=20!/[(16)!*4!]\\ C=4,845](/tpl/images/0109/2132/83bb8.png)
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