It was my birthday! When is yours?

Born2killxYou can do better than that! One person's birthday could be Jan. 1 and the other's could be Jan. 2.

Are the formula related?
This one is challenging...*no wiki mega!!*

It's not really that hard. If there are 365 days in a year, how many people would it take to ensure with 100% certainty that there are two people with the same birthday?

How about 46?

...No. Where did you get that number?Note: It has nothing to do with the formula. It's just a math question.There are 365 days in a year. How many people would it take to ensure with 100% certainty that there is at least one pair with the same birthday?

Divide 365 by the population of the people on the Earth for a simple example
Though breeding times for humans are generally lower mid month and in hotter seasons

Born2killx · #64...No. Where did you get that number?Note: It has nothing to do with the formula. It's just a math question.There are 365 days in a year. How many people would it take to ensure with 100% certainty that there is at least one pair with the same birthday?

Easy. 366. 365 (1 for each day), and 1 more to act as a wild card, the wild card matching with any day of the year.June 2nd, btw.

Finally. :PSee? It's not that hard.

Replying to #67

But what if person number 366 was born on February 29th?So the real answer is 367 to be 100% certain that you'll have two matching birthdays in a group of people. 366 to be about 99.9% sure.

mine is auust 17. Even though I can never use it to get out of school (summer lol), I still wish you a happy birthday man!

TirithRR · #68But what if person number 366 was born on February 29th?So the real answer is 367 to be 100% certain that you'll have two matching birthdays in a group of people. 366 to be about 99.9% sure.

Read my first post.

Born2killxAnd considering no one has the birthday February 29.

Reading comprehension; work on it.

Well then why not just say"Assuming everyone has a birthday in November"*rollseyes*

Did I mention breeding times?

Don't you remember that February 29 only exists once every four years? I was just removing any variables which would cause people to be smart-asses about it.

Anyone know where to post my birthday?
A bit early for it but its July 16th.

meganovaHuh?
Are you doing that formula by yourself?

Yes, I used OpenOffice to made that one.
But I also needed the web to back me up.
It's helpful when you can derive such things by your own.
I even wrote a little program to calculate that likelihood.That's why I know it's higher than 50% with 23 people. :P

Getting back to the thread started, my birthday is on December 17.

My birthday is September the 18th, and you know what happens four days from then this year? HALO 3 O.D.S.T.!!

augest 15. proud leo lol

4th May!