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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 first-grade students occupy the first 3 rows? 25P20 5P5 × 20P15 15C15 × 10C5 15P15 × 10P5 15P15 × 10C5

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    • one year ago
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    • one year ago
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