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anonymous
 one year ago
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 the firstgrade students occupy the first 3 rows?
25P20
5P5 × 20P15
15C15 × 10C5
15P15 × 10P5
15P15 × 10C5
anonymous
 one year ago
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 the firstgrade students occupy the first 3 rows? 25P20 5P5 × 20P15 15C15 × 10C5 15P15 × 10P5 15P15 × 10C5

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