\(lim_{n \enspace \to \enspace ∞}\left [ \frac{1}{n^2 – 1} + \frac{2}{n^2 – 1} + …. + \frac{n}{n^2 – 1} \right ] = \)

0

0

60%

−12

−12

20%

12

12

20%

13

13

0%