Right. Simple experiment.

I want the first 22 posters after me to write down their birthday (e.g. March 1st)

No spoilers please. All will be explained.

My birthday is September 2nd.

April 18 ......

April 14 .......

and I'm sure I'm going to regret this for some reason :hihi:

April 15th (nowt that can't be seen in my forum profile) ;)

Jan 12th ... My 31st will be ushered in with a bowl of noodles and a tin of tuna (I'm on nights :( )


Birthday meal on my rest day though :D WOOOOOOOOOOOOHOOOOOOOOOOOOOOOO!

June 7th..........

January 26th

July 22nd

*wonders what this is all about!*

July 22nd

*wonders what this is all about!*

It's v intriguing weenirenni! So much so I'm going to have to help with this (11th January)

April 22nd. Come on Mike do tell.

September 1st

December 13th

16th January

1st febuary

12 January

5th April..............

12 January

SNAP baby ........ Cosmically aligned :D

There we go- the theorem works for the Sheffield Forum random sample anyway.

Post 18 and we already have 2 people who share a birthday.

4th September :)

Feb 3rd...........

March 20th................

There we go- the theorem works for the Sheffield Forum random sample anyway.

Post 18 and we already have 2 people who share a birthday.

Indeed....Here is the explanation.

Take the following question:

"How many people do you need in a room at a party before the odds are good ( i.e. greater than 50%) that at least two of them share a birthday?" The answer is not as it seems....

The 'birthday paradox' problem states that if you put 23 (or more) randomly selected people in a room, there is more than a 50% chance that at least 2 people will share the same birthday. The solution is not a paradox in the logical sense, it just contradicts our intuition.

This seems surprising because we are used to comparing our particular birthdays with others and only rarely finding a perfect match. The probability of any two individuals having the same birthday is just 1/365. Even if you were to ask 20 people, the probability of finding someone with your birthday is still less than 1/20. But the odds improve dramatically when a group of people ask each other about their birthdays because then there are many more opportunities for a match-up. One way to calculate the probability of a birthday match is to count the pairs of people involved. In a room of 23 people, there are (23 × 22)/2, or 253, possible pairs. Each pair has a probability of success of 1/365 = 0.00274 (0.274%), and thus a probability of failure of (1 - 0.00274) = 0.99726 (99.726%). The probability of no match among any of the pairs of people is 0.99726 to the 253th power, which is 0.499 (49.9%). So the probability of a successful match is (1 - 0.499), or slightly better than evens. With 42 people, the probability of a birthday match climbs to 90%.

Good eh? (well, I thought it was pretty neat)

The only reason I stumbled across this little gem was because I was researching cryptographic attacks on 448 bit encryption keys. No wonder I don't have a girlfriend.

I saw this one explained recently on a TV programme, but I can't remember which one (I know, I watch really exciting TV programmes, don't I?)

If my daughter had been born 7 hours earlier, she would have been born on MY birthday.
If my son would have been born in England instead of Singapore which was 8 hours ahead, he would have been born on my Grandmothers birthday.
My brother, was born on our Mothers birthday.:)

Is that anything like what you're saying?

May 16th. I seem to be the first one with a May birthday. Does that mean Taureans are less likely to post on threads with maths in the title? :roll:

If my daughter had been born 7 hours earlier, she would have been born on MY birthday.
If my son would have been born in England instead of Singapore which was 8 hours ahead, he would have been born on my Grandmothers birthday.
My brother, was born on our Mothers birthday.:)

Is that anything like what you're saying?

I was born on MY birthday :hihi:

Apologies....as the section says....I'm bored!

I conceived my first child exactly 50 years to the day that my grandmother conceived my mother, and at exactly the same age.

Not really a birthday paradox, but still... I find it fascinating.

OK - I know we're outside the first 22, but mine is 22nd July, like Weenireeni

mine is 13th February like Sharpsinger

I am the first poster with a birthday in August. It is weird we have a number of matches, but not all months covered. Too bizarre. Thanks for the post MB it was very interesting.