is created by David Witten, a mathematics and computer science student at Vanderbilt University. For more information, see the "About" page.

Boy/Girl Population

The Problem

In a country in which people only want boys every family continues to have children until they have a boy. If they have a girl, they have another child. If they have a boy, they stop. What is the proportion of boys to girls in the country?

The Solution

MathJax TeX Test Page

Free Throw Shooting

Train Fly Riddle