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The Birthday puzzle

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Head Penguin
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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.

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Head Nurse
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Hey Danny and Tamar! Dianna here and my birthday is July 31.
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Hi .... Fae here .... Birthday is 21 July
Prolific Writer
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Danny, Tamar, Dianna, Jennifer.....I'm Mysteria and my birthday is May 27th.
Lurker
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I wonder if that means at 46 people there's a 100 percent chance of a match? leggnassman - October 14
Story Verifier
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I'm Paul and mine is July 18
I am always a gentleman.
Lurker
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Hi ladies and gentleman, I go around here by pronoun and my birthday is December 1st.
Lurker
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Kitty mine is December 30
The Engineer
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Simar ,mine is July 23
Find Simar on:
1. Skype: Simar Singh
2. Kik: simar2308
Active Ink Slinger
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Hi all! Kitty here and mine is 23rd April
[
Mazztastic
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Quote by Kittypusscat
Hi all! Kitty here and mine is 23rd April


BINGO!!! My birthday is also the 23rd of April!!!

Head Penguin
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So we did it with just 13 people!

Apparently, the best way it was explained to me and I'm not sure I get it is this:

When you tell people this they tend to think about themselves, but the puzzle is not asking what the chance is that someone will share a birthday with YOU. The chances of that are much higher. This is just that anyone shares a birthday with anyone else. Apparently you need only 70 people in the room for the chances to be virtually 100%

A First Class Service Ch.5

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Cheeky Chick
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I suppose we can keep it going, to see how long it takes again...

So, hi, I'm Poppet. 14th of September is my birthday.
Lurker
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sweetsexybitch december 5th
Big-haired Bitch
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I'm Danielle...born on March 2nd.

░P░U░S░S░Y░ ░I░N░ ░B░I░O░


Active Ink Slinger
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Chrissy May 12th


Art can never exist without naked beauty displayed.
Lurker
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Quote by Chrissy123
Chrissy May 12th

jen0707 also may 12th
Lurker
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Ajax - March 1st
Rainbow Warrior
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Bethany here - May 31st
Active Ink Slinger
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Dane here, August 15
Active Ink Slinger
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Hi Danny, I'm July 3rd.
One of my Lush friends is also the 3rd.
Gramps

The quiet and always horny old guy in Sunny Florida USA
Active Ink Slinger
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Hi, I'm Pete April 28 is my birthday
Lurker
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Quote by Dani
I'm Danielle...born on March 2nd.


This is my brothers birthday!
Thread holder what the rules say, does this count as well?
Head Penguin
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Quote by She


This is my brothers birthday!
Thread holder what the rules say, does this count as well?


No, cos he's not in the room. You gotta be in the room!

A First Class Service Ch.5

A steamy lesbian three way

Clumeleon
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Little facts and experiments like this are great for the maths classroom. Probability is one of the most fun things to teach.

I'm Clum, born March 3.
Scarlet Seductress
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Quote by clum
Little facts and experiments like this are great for the maths classroom. Probability is one of the most fun things to teach.

I'm Clum, born March 3.


Give us a lesson then? smile

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*