Problem of the Week 1127
A Tale of Two Sons
A woman has two children, not twins. One of them is a boy who was born on a Tuesday.
What is the probability that she has two boys?
Assume the basic boy-girl probability is 1/2. "One" means "at least one."
Source: Gary Foshee, seen on Ed Pegg's puzzle page, entry for Sept 7, 2009.
© Copyright 2009 Stan Wagon. Reproduced with permission.