Hi everyone,

Two comments on the Exam 3 Review sheet:

- In class, I proposed a strategy for solving problem #2, which was to break into cases based on the remainder when n was divided by 4. While I believe this strategy will work, it is simpler to simply look at the cases “n is odd” and “n is even”. Despite my comments in class, this method really will work (can anyone explain why?)
- It looks like the answer for problem #7 in the answer key was all wrong – I’m not sure what happened. In any case, I’ve updated it, so it should now be correct.

Both of these corrections were due to a diligent student who will remain nameless (but, in fact, it was Irania – nice work!).

Let me know if you find anything else,

Prof. Reitz