SOLUTION: How mnay people do you need to gather to be sure that at least two of them have a birthday in the same month?

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Question 572550: How mnay people do you need to gather to be sure that at least two of them have a birthday in the same month?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
There are 12 months, so according to pigeonhole principle, you need 13 so that at least two of them have a birthday in the same month.