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OpenStudy (anonymous):
A school bus has 25 seats, with 5 rows of 5 seats. 15 students from the first grade and 5 students from the second grade travel in the bus. How many ways can the students be seated if all of the second-grade students occupy the first row? 25P20 5P5 × 20P15 5C5 × 25C14 5P5 × 15P15 5P5 × 25C15
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OpenStudy (anonymous):
i never saw this before
OpenStudy (anonymous):
@Donblue22
OpenStudy (anonymous):
@perl
OpenStudy (anonymous):
http://openstudy.com/study#/updates/52656b72e4b029b030da278c Its the same question and it tell you the solution :)
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