Hi everyone,

Two comments on the Exam 3 Review sheet:

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