The Birthday Paradox

How many people need to be in a room before there’s a 50% chance that two of them share the same birthday? Is it about 180, since that’s around half of 365? Is it only 100? The real answer is surprisingly much, much smaller.

If you have just 23 people in a room, the odds of whether two get presents on the same day is a coin flip. Get 50 people together and that shared-birthday probability skyrockets to 97%. A handful more and it’s a virtual statistical certainty.

Really? Yes, really! With the aid of tiny plastic babies and some mathematics, Kevin proves and visualizes this surprising veridical paradox.

**** LINKS ****

Birthday Attack Example In Hacking

Birthday Attack Hash Collision

Hashing Algorithms And Security – Computerphile

Discussion On The Birthday Attack

The Birthday Attack


Vsauce2 Links
Twitter: https://twitter.com/VsauceTwo
Facebook: https://www.facebook.com/VsauceTwo

Hosted, Produced, And Edited by Kevin Lieber
Instagram: http://instagram.com/kevlieber
Twitter: https://twitter.com/kevinlieber
Website: http://kevinlieber.com

Research And Writing by Matthew Tabor

Huge Thanks To Paula Lieber

Get Vsauce’s favorite science and math toys delivered to your door!

Select Music By Jake Chudnow: http://www.youtube.com/user/JakeChudnow


Products You May Like

Articles You May Like

Why your community needs to be Epilepsy safe | Matthew Summerfield | TEDxHopeCollege
Why aren’t commercial jets getting faster? #shorts #science #SciShow
Dealing Cards with Cryptography (with Ron Rivest) – Numberphile
How a slinky falls in slow motion #shorts
13 Surprising Facts About Old Hollywood

Leave a Reply

Your email address will not be published. Required fields are marked *