What is the probability that among 9 delegates randomly selected at this seminar, 3 arrived by air, 3 by bus,1 by automobile and 2 arrived by train.

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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The probabilities are 0.40, 0.20, 0.30 and 0.10 respectively, that a delegate to a certain seminar arrived by air, bus, automobile or train. What is the probability that among 9 delegates randomly selected at this seminar, 3 arrived by air, 3 by bus,1 by automobile and 2 arrived by train.

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