Who Shares Your Birthday?

The video explores the probability of shared birthdays, known as the birthday paradox, and explains how few people are needed for a high chance of shared birthdays. It uses examples like paper folding to illustrate exponential growth and discusses the probability of sharing a specific birthday. The video also examines how many Facebook friends are needed to cover all birthdays, highlighting the challenges of probability and exponential growth.

How many people would you need to have a 90% chance of one person sharing your specific birthday?

What is the average number of friends needed on Facebook to fill every birthday?

Discuss the implications of needing over 21,000 friends to have a 90% chance of hitting every birthday.