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I bet you know how to calculate the odds? Just calculate the chances of NOT matching a birthday... For 2 people it would be 364/365 - cause one day has been used up... And then 1 - (364/365) are the odds of a match. For three people it would be 1 - (364/365 * 363/365) - 363 cause two days have been used up when you're trying to find a new day for the third person... and then 1- (364/365 * 363/365 * 362/365 * 361/365....). It gets to 50% pretty quickly

-Mike

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