car park attendant loses the name tags for a set of seven car keys, so hands out the keys randomly when the seven owners return. How many ways are there of returning the keys so that at least two people receive their o

car park attendant loses the name tags for a set of seven car keys, so hands out the keys randomly when the seven owners return. How many ways are there of returning the keys so that at least two people receive their o

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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A car park attendant loses the name tags for a set of seven car keys, so hands out the keys randomly when the seven owners return. How many ways are there of returning the keys so that at least two people receive their own keys?

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