Mathematics

6 November, 19:04

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?

a.) 25P20

b.) 5P5 * 20P15

c.) 15C15 * 10C5

d.) 15P15 * 10P5

e.) 15P15 * 10C5

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