The counting principle is even easier to understand after reading this tutorial. There are practice problems and a teacher resource page included.

[Free Registration/Login may be required to access all resource tools.] This Concept introduces students to the most basic counting rule: the multiplication rule. It also explains the probability of simple random samples.

How many times does the chorus repeat in your favorite song? How many times have you listened to that chorus? Repetition in music isn't just a feature of Western pop songs, either; it's a global phenomenon. Why? Elizabeth Hellmuth...