1. Determine whether the sequence  converges or diverges. If it converges, give the limit and show how you know it converges to that value. Give justifications for each step in your reasoning.
 
 

2. Determine whether the sequence a_n =  converges or diverges. If it converges, give the limit and show how you know it converges to that value. Give justifications for each step in your reasoning.
 
 

3. Find the first four partial sums of the series .