Quote:
Originally Posted by lawn psycho
Come on, you can do better than that. Here's a simple one that is counterintuitive to people. What is the probability that two people share the same birthday (only needs to be the same month/day and can ignore year). Hint: Not as common as you would think.
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The first person can have any birthday. That gives him 365 possible birthdays out of 365 days, so the probability of the first person having the "right" birthday is 365/365, or 100%.
The chance that the second person has the same birthday is 1/365. So the probability that both people have this birthday, you multiply their separate probabilities. (365/365) * (1/365) = 1/365, or about 0.27%.