You Have to Share Your Birthday — But Not Necessarily Your Cake


 23 people 50 percent chance of shared birthday 
Put 23 people in a room and there is a statistical probability of 50% that two of them have the same birthday. 

Increase the number of people to 75, and the odds are 99.9% two of them will celebrate their birth on the same date. 

Not convinced? See the math here.

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