1. The problem statement, all variables and given/known data heres the equations: http://img407.imageshack.us/img407/738/untitledzk8.jpg there are two equations, a and b. 2. Relevant equations 3/n^2 for a, and 1/n for b. 3. The attempt at a solution Using the limit comparison test, i don't understand why to use 3/n^2 and 1/n for these equations. It was explained that we use the largest n in the numerator and denominator, but what we picked, clearly isn't the largest??? please help. thanks. also, how does a converge, and b diverge??