Mathematics

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.

Develop your Amazon birthday gift list here.

As an Amazon Affiliate, Commonplace Fun Facts receives compensation for every qualified purchase from a linked Amazon product.

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