SOLUTION: HOW MANY PEOPLE DO YOU NEED TO GATHER TO BE SURE THAT AT LEAST TWO OF THEM HAVE A BIRTHDAYS IN THE SAME MONHT?

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Question 219887: HOW MANY PEOPLE DO YOU NEED TO GATHER TO BE SURE THAT AT LEAST TWO OF THEM HAVE A BIRTHDAYS IN THE SAME MONHT?
Found 2 solutions by stanbon, josmiceli:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Check the following site.
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http://en.wikipedia.org/wiki/Birthday_problem
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Cheers,
Stan H.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The answer is 13
If there are only 12 people, there is a
possibility that each has a birthday in a
different month