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Probability problem - birthdays

 
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Apr6-11, 03:31 AM   #1
 
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Probability problem - birthdays

1. The problem statement, all variables and given/known data
44. What is the probability that at least two people in your class (assume a class of 30 students) have the same birthday?
2. Relevant equations

I'm not sure, to be honest.

3. The attempt at a solution

I was helping out my roommate with his probability homework, and this question came up. I'm not sure how to answer it. How is this done?
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Apr6-11, 04:07 AM   #2
 
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http://lmgtfy.com/?q=same+birthday+probability
Apr6-11, 04:11 AM   #3
 
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Ahaha... I did not know there was a Wikipedia article on what seemed to me to be just an unusually difficult homework problem. Thanks!
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