My Math Forum  

Go Back   My Math Forum > College Math Forum > Advanced Statistics

Advanced Statistics Advanced Probability and Statistics Math Forum

LinkBack Thread Tools Display Modes
September 26th, 2010, 02:39 PM   #1
Senior Member
Joined: Nov 2009

Posts: 169
Thanks: 0

prob that at least one letter was correct

Suppose that an absentmined secretary wrote n letters and sealed them in envelops before writing the addresses on the envelops. Then she wrote the n addresses on the envelops at random. What is the prob that at least one letter was addressed correctly?

Im thinking to find the prob that no one was addressed right then subtract it from 1, and the chance address the first one right is 1/5, and the second one is 1/4, what if the first one was wrong already?
450081592 is offline  
September 26th, 2010, 03:34 PM   #2
Global Moderator
CRGreathouse's Avatar
Joined: Nov 2006
From: UTC -5

Posts: 16,046
Thanks: 938

Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms
Re: prob that at least one letter was correct
CRGreathouse is offline  

  My Math Forum > College Math Forum > Advanced Statistics

correct, letter, prob

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to mask letter frequency while encrypting mobel Computer Science 4 February 13th, 2014 06:12 AM
Word/letter play Denis New Users 7 December 20th, 2012 08:32 PM
Letter drawing probability flipg Advanced Statistics 13 January 25th, 2012 12:23 AM
Basic algebra: solve formula for a letter eurekagold Algebra 3 March 18th, 2011 10:01 AM
Letter outcome. stuart clark Algebra 1 January 17th, 2011 09:06 AM

Copyright © 2019 My Math Forum. All rights reserved.