wu :: forums
« wu :: forums - Holidays in Bahamas »

Welcome, Guest. Please Login or Register.
Mar 29th, 2024, 8:48am

RIDDLES SITE WRITE MATH! Home Home Help Help Search Search Members Members Login Login Register Register
   wu :: forums
   riddles
   hard
(Moderators: william wu, Icarus, Eigenray, SMQ, towr, ThudnBlunder, Grimbal)
   Holidays in Bahamas
« Previous topic | Next topic »
Pages: 1  Reply Reply Notify of replies Notify of replies Send Topic Send Topic Print Print
   Author  Topic: Holidays in Bahamas  (Read 4828 times)
Altamira_64
Junior Member
**





   


Posts: 116
Holidays in Bahamas  
« on: Oct 10th, 2012, 11:55am »
Quote Quote Modify Modify

4 couples are going on holiday in Bahamas to a 5-star hotel. The receptionist gave them four consecutive rooms with numbers 1 to 4. The women went upstairs to choose rooms and stayed to one of the rooms each, while their husbands were having a drink at the bar. After some drinks, they decided to go upstairs to their rooms.  
"If we all go upstairs and start opening the 4 doors at random until we find our wife, what are the chances to get to the correct room with 2 attempts each?" asked the first man.
 
"This is easy", says the second. "Since we will open 2 out of 4 doors, each of us has 50% probability to locate his wife. So, in order for all four of us to make it, the probability is (1/2)^4, that is, 1/16."
 
"Wrong!" says the third. There is a way to get to the correct room with probability greater than 40% and without havng to communicate with our wives or between us, after the first of us goes upstairs."
 
What is the method he is suggesting?
« Last Edit: Oct 10th, 2012, 12:29pm by Altamira_64 » IP Logged
Altamira_64
Junior Member
**





   


Posts: 116
Re: Holidays in Bahamas  
« Reply #1 on: Oct 11th, 2012, 7:41am »
Quote Quote Modify Modify

Guys, silly question, how do you put this "NEW" flag next to the Riddle Subject??
IP Logged
towr
wu::riddles Moderator
Uberpuzzler
*****



Some people are average, some are just mean.

   


Gender: male
Posts: 13730
Re: Holidays in Bahamas  
« Reply #2 on: Oct 11th, 2012, 8:54am »
Quote Quote Modify Modify

Not?
Besides, I don't think it's new; I recall a very similar riddle with, I think lockers.
 
[edit] http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_har d;action=display;num=1138457723 [/edit]
« Last Edit: Oct 11th, 2012, 10:08am by towr » IP Logged

Wikipedia, Google, Mathworld, Integer sequence DB
rmsgrey
Uberpuzzler
*****





134688278 134688278   rmsgrey   rmsgrey


Gender: male
Posts: 2872
Re: Holidays in Bahamas  
« Reply #3 on: Oct 12th, 2012, 4:32am »
Quote Quote Modify Modify

on Oct 11th, 2012, 7:41am, Altamira_64 wrote:
Guys, silly question, how do you put this "NEW" flag next to the Riddle Subject??

 
Forum topics are flagged "new" when there's a post in the thread since the last time you viewed it.
IP Logged
Altamira_64
Junior Member
**





   


Posts: 116
Re: Holidays in Bahamas  
« Reply #4 on: Oct 12th, 2012, 7:56am »
Quote Quote Modify Modify

OK, so indeed my question was silly  Embarassed
 
Thanks for clarifying!!
IP Logged
Pages: 1  Reply Reply Notify of replies Notify of replies Send Topic Send Topic Print Print

« Previous topic | Next topic »

Powered by YaBB 1 Gold - SP 1.4!
Forum software copyright © 2000-2004 Yet another Bulletin Board