Possible Duplicate:
Different methods to compute $\sum_{n=1}^\infty \frac{1}{n^2}$.
What is $\lim \limits_{n\to\infty} \sum\limits_{k=1}^n \frac{1}{k^2}$ as an exact value?
Possible Duplicate:
Different methods to compute $\sum_{n=1}^\infty \frac{1}{n^2}$.
What is $\lim \limits_{n\to\infty} \sum\limits_{k=1}^n \frac{1}{k^2}$ as an exact value?