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Counting Rocks!

This is the home page for an Open Educational Resources (OER) free online textbook and video series by Henry Adams, Rachel Pries, and myself. The textbook, called Counting Rocks!, was also coauthored by Kelly Emmrich and Shannon Golden.

Here is the latest version of the textbook, as of November 2023:

Counting Rocks! An Introduction to Combinatorics

Here is the video series:

Video lectures

Feedback Form

If you find any typos, please fill out the form below!

Feedback Form

Your help in improving the textbook and videos is appreciated. If your typo correction or suggestion is incorporated, you will be listed in the preface of the next version of the textbook.