A questionnaire is sent to 7 first year students, 3 second year students, 8 third year students and 6 fourth year students. If only three questionnaires are returned, what is the probability that at least two of them are returned by students from the same year? You may assume that each student is equally likely to return the questionnaire.

A questionnaire is sent to 7 first year students, 3 second year students, 8 third year students and 6 fourth year students. If only three questionnaires are returned, what is the probability that at least two of them are returned by students from the same year? You may assume that each student is equally likely to return the questionnaire.

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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