1. The problem statement, all variables and given/known data First questions is: How to choose between using the ordinary comparison test, or using the limit comparison test? 2. Relevant equations 3. The attempt at a solution then, for these two problems below, i decide to use the limit comparison test: SUM n_infinity (3n - 2)/(n^3 - 2n^2 + 11) then its said to look for the largest degree of terms in the numerator and denominator and divide through which is to divide by: 3/n^2 but why is 3/n^2 the largest term, when there is a n^3 in there, why not 3/n^3 ? ======================= also, i see that 1/n belongs to the harmonic series, but what series does 3/n^2 belong to? thankyou.