For Fri:

Proof for Feedback:

Combinatorial proof

For Friday:

1. Do your proof for feedback above.
2. Look at solutions to old proofs (Materials Archive tab above).
3. Practice basic counting problems.  At this point (with all our various principles:  multiplication, addition, subtraction, division), you should be able to do all the exercises in Sections 3.1 through 3.5 of Hammack.  Please do as many of these as you have time for (answer to odds are in the back).  This is the type of problem we’ll see on the next wednesday quiz (which is on counting).