Here is the problem set.
We give a few correct and wrong solutions to each problem below.
Go through the correct solutions. There are more than one ways to solve a problem. Is one solution better than the other?
Go through the problematic solutions also. What was the mistake?
Problem 1
Good:
answer 1
Problematic:
answer 2
answer 3
answer 4
Problem 2
Good:
answer 1 (construction is correct, but proof is not complete!)
Problem 3 part A
Good:
answer 1
Problematic:
answer 2
Problem 3 part B
Good:
answer 1
Problematic:
answer 2
answer 3
Problem 4
Good:
answer 1
Problematic:
answer 2
answer 3