| Article ID: | iaor201522368 |
| Volume: | 36 |
| Issue: | 2 |
| Start Page Number: | 41 |
| End Page Number: | 46 |
| Publication Date: | Jun 2014 |
| Journal: | Teaching Statistics |
| Authors: | Falk Ruma |
| Keywords: | probability |
The article asks about the minimal number of persons required for achieving a probability 1/2 that a. At least two share a birthday, b. At least one shares the reader's birthday. A basic question about the necessary number of checks underlies both problems.