204k views
5 votes
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?

A) 25P20
B) 5P5*20P15
C) 5C5*25C14
D) 5P5*15P15
E) 5P5*25PC15

2 Answers

7 votes

Answer:

It's option B

Explanation:

B. 5P5 × 20P15

User Hugo Demiglio
by
8.7k points
4 votes
Number of ways the second grade students can sit on the first row is 5! = 5P5
Number of ways 15 first grade students can sit in the remaining 20 seats is 20P15

Therefore, required number of ways is 5P5 * 20P15. (option B)
User Abdul Aleem
by
8.9k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.