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 70, and the odds are 99.9% two of them will celebrate their birth on the same date.

birthday paradox.png

Not convinced? See the math here.

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