# WONDER #1757: What Is the Birthday Paradox?

Question **1** of **3**

## How many people do you need in a room to have a better-than-50% chance that two of the people will share a birthday?

- 364
- 183
- 23
- 75

Question **2** of **3**

## Is the birthday paradox a logical paradox?

- yes
- no
- certainly
- definitely

Question **3** of **3**

## How many people do you need in a room to have a 99.9% probability that two people will share the same birthday?

- 367
- 183
- 23
- 70

Check your answers online at https://wonderopolis.org/wonder/what-is-the-birthday-paradox.