A. In example 9.12 I had a hard time following the progression of a proof. I think I don't understand too well how to interpret it from the beginning but after that I could see how they collected the terms and got their result. So my challenge is understanding how to interpret that statement and begin but after that I can work through it.
B. I found it interesting that in determining the number of different permutations you can use factorials. I like to be able to see what the total number of different combinations is and then work to fill them in. Kind of like what we do in class with list the beginning and end and then fill in the middle. It is a good guide.
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