Sigma INFINITY and k=3 of (k-1) divided by (2k+1) .

1. what are the first three terms for this series?

2. what are first three terms of partial sums for this series?

What are the limits of these following sequences or why do they diverge, please show work so I may understand, thank you! Please keep work calculation in reduced fraction. 3. ln(n^2) divided by (4n+3n) and 4. (3n^3 + 2n + 9) divided by (6n - 4n^3)