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09-06-2004, 03:33 AM
well
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Join Date: May 2003
Posts: 25
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For n people (with 0<=n<=365), the probability of them not having all different birthdays is:
1 - 365!/ ((365-n)!*365^n)
For n=23 this is: .507297
For n=30 this is: .706316
Note: Feb 29 is ignored.
well
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