Probability problem - birthdays

[Char. Limit]

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?

[Borek]

http://lmgtfy.com/?q=same+birthday+probability

:tongue:

[Char. Limit]

http://lmgtfy.com/?q=same+birthday+probability

:tongue:

Ahaha... I did not know there was a Wikipedia article on what seemed to me to be just an unusually difficult homework problem. Thanks!