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The Birthday puzzle Options · View
seeker4
Posted: Monday, June 30, 2014 11:48:51 AM

Rank: Story Verifier
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Joined: 10/17/2012
Posts: 4,596
Location: Canada
Liz wrote:


*twirls hair with a pencil*


That is such a sexy gesture, you know.

One of my favorite, and most viewed, stories. Bill and his daughter-in-law Becky relieve their sexual frustration with a steamy summer fling.

Frustration and Relief

The April Stories:

April's Secret - A college student learns a sexy secret from his girlfriend's past

The Pastor's Secret - A lonely minister seeks solace from an escort
clum
Posted: Monday, June 30, 2014 12:05:54 PM

Rank: Clumeleon
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Joined: 5/13/2011
Posts: 5,239
Location: Kirkcaldy, United Kingdom
Liz wrote:
Give us a lesson then? :)

If the answer to the problem is 23, then why does doubling that figure not increase the probability to 100 percent?

*twirls hair with a pencil*


It's pretty clear (I think) that to have a probability of 1 (or 100%), i.e., to make it absolutely certain that two people will share a birthday, then you need 367 people (invoke the Pigeonhole Principle).

The relationship is quite a complex one, I imagine, and certainly not linear, as you're conjecture would imply. It's actually not a million miles away from the topic of my masters dissertation (look up the Cocktail Party Problem for a flavour of it). Essentially, you can view it as a huge network, and as the number of people increases, the number of connections increases even more quickly, so the probability of witnessing the particular kind of connection you're looking for increases quickly, too.

She Just Wants To Be

Third place entry in the Toy With Me competition.
DanielleX
Posted: Monday, June 30, 2014 2:35:18 PM

Rank: Blonde Bombshell
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Posts: 2,846
Location: Liverpool, United Kingdom
Liz wrote:


Give us a lesson then? :)

If the answer to the problem is 23, then why does doubling that figure not increase the probability to 100 percent?

*twirls hair with a pencil*


I don't know. My friend explained it to me and it was double Dutch. I believe as you increase the size of the group of people the odds decrease exponentially, so with 46 people there's better than a 9:1 chance that two people will match. What I can't get my head round is why this works. It's so counter-intuitive.


angeldust
Posted: Monday, June 30, 2014 2:36:16 PM

Rank: Forum Guru

Joined: 1/21/2012
Posts: 1,292
Location: United States
Hi I'm Angeldust my birthday id July 3rd
eatme549
Posted: Monday, June 30, 2014 3:40:40 PM

Rank: Active Ink Slinger

Joined: 3/20/2012
Posts: 32
Location: sky, Canada
jasmine here was born on 21 of jan
SereneProdigy
Posted: Monday, June 30, 2014 3:42:18 PM

Rank: Cryptic Vigilante

Joined: 7/16/2013
Posts: 2,462
Location: Caught on tape
There's a complete Wikipedia page about this problem, for those interested in the mathematical solution:

http://en.wikipedia.org/wiki/Birthday_problem

And my 'Lush birthday' is May 1st.
barelylegalslut119
Posted: Monday, June 30, 2014 3:59:13 PM

Rank: Rookie Scribe

Joined: 12/17/2012
Posts: 1
Location: Gozo, Malta
Sally here... born March 1st - I saw someone else was too
elizabethblack
Posted: Monday, June 30, 2014 4:12:12 PM

Rank: Forum Guru

Joined: 8/26/2013
Posts: 1,080
Location: Shenandoah Valley, United States
Elizabeth here...born September 8th


Will_greybeard
Posted: Monday, June 30, 2014 4:38:21 PM

Rank: Forum Guru

Joined: 9/30/2012
Posts: 591
Location: Chorlton cum Hardy, United Kingdom
Hi I'm Will, and my birthday is February 19th, the same day as the Duke of York, although I am much better looking.

Guest
Posted: Monday, June 30, 2014 4:59:55 PM

Rank: Lurker

Joined: 12/1/2006
Posts: 671,583
Luke D, Feb 26 was the day they decided once calendars were invented, but that is just an estimate.
cal_teddybear
Posted: Monday, June 30, 2014 5:34:15 PM

Rank: Active Ink Slinger

Joined: 1/25/2011
Posts: 14
Location: United States
hello I'm Chris and my birthday is June 29th
Henry73au
Posted: Monday, June 30, 2014 5:44:43 PM

Rank: Forum Guru

Joined: 6/29/2014
Posts: 1,122
Location: Australia
Howdy all, I'm Henry and birthday is January 15th
HopefullAuthor
Posted: Tuesday, July 01, 2014 8:32:00 PM

Rank: Active Ink Slinger

Joined: 10/15/2013
Posts: 20
Location: United States
DanielleX wrote:
So, the other day I was talking to my friend and she said, "Danny, how many people do you need to get in a room to have more than a 50-50 chance that two people will share a birthday?"

I was like, "That's a bit random! I don't know, top of my head, 366."

"No!"

"OK, I don't know Ashlie, tell me."

"Twenty three."

"Twenty three!" Bullshit!"

Apparently, it's 23. I don't know how it can be 23, and even when she explained it, I didn't get it. So, I want to test this.


This is how this will work. We'll call this thread our 'room.' Every time someone comes in, you have to introduce yourself with your username and give your date of birth (not the year, I don't need to know how old you are).

Let's get this running for a while and then check the results. I'm sceptical about this, but I kind of want it to work. Please don't 'monitor' the thread and wait for a match, as that will spoil it.

I'll start. My name is DanielleX. My date of birth is 15th March.



You can tell your friend that you don't necessarily have to have 23 people in order to find a matching set of birthdays. I couldn't believe my eyes when I read your post. You may not believe this but it is the truth. I'm HopefullAuthor and my birthday is March 15. By the way Danielle, HAPPY belated birthday. I hope you had a wonderful day.
StillUndecided
Posted: Wednesday, July 02, 2014 1:24:52 AM

Rank: Captain Turtle

Joined: 12/27/2011
Posts: 834
Location: In my shell, United Kingdom
I don't think I've seen anyone on Feb 9th yet...here is me throwing that out there.

Insert something witty here.
clum
Posted: Wednesday, July 02, 2014 2:10:34 AM

Rank: Clumeleon
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Joined: 5/13/2011
Posts: 5,239
Location: Kirkcaldy, United Kingdom
Willyc2licu wrote:
Hi I'm Will, and my birthday is February 19th, the same day as the Duke of York, although I am much better looking.


But do you have 10000 men?

She Just Wants To Be

Third place entry in the Toy With Me competition.
DanielleX
Posted: Wednesday, July 02, 2014 1:12:11 PM

Rank: Blonde Bombshell
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Joined: 11/6/2011
Posts: 2,846
Location: Liverpool, United Kingdom
clum wrote:


But do you have 10000 men?



Lfunny





Guest
Posted: Wednesday, July 02, 2014 2:18:26 PM

Rank: Lurker

Joined: 12/1/2006
Posts: 671,583
Simply_me may 12th
Strangerlyd
Posted: Saturday, July 05, 2014 9:24:27 AM

Rank: Forum Guru

Joined: 8/14/2013
Posts: 3,899
Location: Somewhere Far and Near, South Africa
Hi I am Strangerlyd - 5 May

TheSensualLady
Posted: Wednesday, July 23, 2014 12:43:03 PM

Rank: Forum Guru

Joined: 6/30/2013
Posts: 17,078
Location: Kissinđź’‹your lips while straddling your lap, Unite
Hello, I'm Racy - October 26
KatieElizabeth
Posted: Saturday, July 26, 2014 7:41:20 AM

Rank: English Rose
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Joined: 10/5/2013
Posts: 841
Location: My own sunny little spot, United Kingdom
I'm Katie and my birthday is the 25th September.
I share my birthday with both Superman and Luke Skywalker. All the goodies together :-?


Click banner to read...
Dani
Posted: Saturday, July 26, 2014 8:01:30 AM

Rank: Big-Haired Bitch
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Joined: 12/25/2010
Posts: 5,710
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For an absolute guarantee 100% of the time, all you need to do is get 367 people in the same room.


Entire_essence
Posted: Saturday, July 26, 2014 6:05:05 PM

Rank: Forum Guru

Joined: 7/21/2014
Posts: 174
Essie. 15 January
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