Who Shares Your Birthday?
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[MUSIC]James K. Polk and Warren G. Harding: Two Presidents… both born on November 2nd.There are 365 possible days that a person could be born, so out of just 44 Presidents,it’s an amazing coincidence that two would share the same birthday… right?Actually, no. In a group of 44 people, there’s a 93% chance that two of them could sharea cake. Here’s why.[MUSIC]First, let’s simplify the problem a bit. Let’s figure out how many people you’dhave to get together in a room to do just better than a 50/50 chance of a birthday match.…Assuming none of them are twins. Or triplets. Or that you’re not at a convention for peoplewhose birthday is on like April 7th or something.You’re the first person in the room. There’s a 100% chance that your birthday is your birthd...
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[MUSIC]James K. Polk and Warren G. Harding: Two Presidents… both born on November 2nd.There are 365 possible days that a person could be born, so out of just 44 Presidents,it’s an amazing coincidence that two would share the same birthday… right?Actually, no. In a group of 44 people, there’s a 93% chance that two of them could sharea cake. Here’s why.[MUSIC]First, let’s simplify the problem a bit. Let’s figure out how many people you’dhave to get together in a room to do just better than a 50/50 chance of a birthday match.…Assuming none of them are twins. Or triplets. Or that you’re not at a convention for peoplewhose birthday is on like April 7th or something.You’re the first person in the room. There’s a 100% chance that your birthday is your birthd...
