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Mathematics 4 Online
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?

OpenStudy (anonymous):

25P20 5P5 × 20P15 5C5 × 25C14 5P5 × 15P15 5P5 × 25C15

OpenStudy (kash_thesmartguy):

C, I think

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