Did you know that in a group of 23 people, having two people with the same birthday (only day and month, and not the year) is more than 50%.
In a group of 60 people or more the probability is greater than 99%.
Not so intuitive huh?
For more details check this link out: http://people.bath.ac.uk/clp20/thebirthdayproblem.html
The graph at the end summarizes it.
You learn something new every day :-)
Ciao
Emre
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