Although I didn’t get a good mark on this midterm test, I believe the way to solve this question 4 on the midterm test is to know how to use the tests very well. In this question, it requires the understanding of  the Ratio Test , the Compansion Test and Alternating Series Test.  First,  you should know how to use ratio test to prove the series converges or diverges Then you should also know how to prove if a series converge or diverge at a specific point. When you are writing the test, do not use lots of time focus on one questions, and try to manage time equally so that you don’t have to rush through.