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11. In how many ways can 4 boys and 5 girls sit in a row if the boys and girls must alternate?

11. In how many ways can 4 boys and 5 girls sit in a row if the boys and girls must alternate?

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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11. In how many ways can 4 boys and 5 girls sit in a row if the boys and girls must alternate? 12. In a regional spelling bee, the 8 finalists consist of 3 boys and 5 girls. Find the number of sample points in the sample space S for the number of possible orders at the conclusion of the contest for: a. all 8 finalists; b. the first 3 positions. 13. Find the number of ways that 6 teachers can be assigned to 4 sections of an introductory psychology course if no teacher is assigned to more than one section. 14. In how many ways can 5 different trees be planted in a circle? 15. How many distinct permutations can be made from the letters of the word INFINITY?
Transcribed Image Text:11. In how many ways can 4 boys and 5 girls sit in a row if the boys and girls must alternate? 12. In a regional spelling bee, the 8 finalists consist of 3 boys and 5 girls. Find the number of sample points in the sample space S for the number of possible orders at the conclusion of the contest for: a. all 8 finalists; b. the first 3 positions. 13. Find the number of ways that 6 teachers can be assigned to 4 sections of an introductory psychology course if no teacher is assigned to more than one section. 14. In how many ways can 5 different trees be planted in a circle? 15. How many distinct permutations can be made from the letters of the word INFINITY?
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