In a certain school the number of students of the second secondary year is 100. 60 girls and 40 boys. The director of the school selects randomly and simultaneously three students from all the classes of the second secondary year. 1. Calculate the probability that the director selects three students of the same gender (three boys or three girls). 236 2. Prove that the probability that the director selects two girls is 539* 3. Calculate the probability that the director selects at least one boy.
In a certain school the number of students of the second secondary year is 100. 60 girls and 40 boys. The director of the school selects randomly and simultaneously three students from all the classes of the second secondary year. 1. Calculate the probability that the director selects three students of the same gender (three boys or three girls). 236 2. Prove that the probability that the director selects two girls is 539* 3. Calculate the probability that the director selects at least one boy.
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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