Math Quiz:  NYT Learning Network

Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network.  My latest contribution, a Test Yourself quiz-question, can be found here:

http://learning.blogs.nytimes.com/2010/11/10/test-yourself-math-nov-10-2010/

I was excited to bring the principle of Inclusion and Exclusion to one of these Times problem, even if it is a simple example.