>>>>Adolph Hitler and Osama Bin Laden share the same birthdate - April 20. Perhaps we should tell mothers to not have children on this day.
>>>
>>>Or should we tell all people not to run the production version of their apps around July 20th?
>>
>>Interesting observation. Good to know :)
>>
>>BTW, who was born on July 25 (my son's birthday)?
>
>This reminds me of a sort of puzzle. Actually, this is pure mathematics.
>
>You have a sample of 24 people, randomly selected. What is the probability that two of them share the same birthday?
>
>Hilmar.

A little over 0.5 (or 50%).

The calculation goes something like

1 - 364/365 * 363/365 * 362/365 .... * 342/365

You work out the probability that they all have different birthdays, then subtract from 1 to get the probability that not all birthdays are different.