# Perfect for Parties: The Great Birthday Riddle

Quick: take a fast guess at this dinner party-worthy math problem. How many people would I have to invite to my party if I wanted a 50 percent chance that two people would have the same birthday? 366 people would give me a 100 percent chance, but what about a 50 percent chance?

I guessed 100.

It turns out, thanks to the magic of probability, that you’d only need 23 people. In that case, there’s a 50/50 chance two people’s birthdays would match. The math isn’t nearly as complicated as it might seem—you can read the whole analysis here via the New York Times. Then you can pose the riddle at dinner—and watch everyone’s eyes widen.

Keep the laughs coming every week!

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My cat just walked up to the paper shredder and said, “Teach me  everything you know.”

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@yoyoha (Josh Hara)

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My parents didn’t want to move to Florida, but they turned 60 and that’s the law.

—Jerry Seinfeld

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Q: What do you call an Amish guy with his hand in a horse’s mouth?

A: A mechanic.

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