Discussion Board - Lesson 19 22 unread replies.22 replies. Welcome to the Discussion Boards. Please note that the Discussion Boards for this course might be formatted a little differently than what you might have seen in other courses. Respond to the following discussion prompts. Number your responses. Did you use the fundamental counting principle or combinations in your project? Explain how and why you did or did not. How did you use modeling in your project? Here is the discussion board rubric (Links to an external site.)Links to an external site