There are 3230 students, each with 1 student card. All of them place their student cards into a box, then a professor randomly distributes 1 card to each student. What is the expected number of students that receive their own card back?

There are 3230 students, each with 1 student card. All of them place their student cards into a box, then a professor randomly distributes 1 card to each student. What is the expected number of students that receive their own card back?

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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