Practice problem
Compute: ∑n=1∞1n(n+1).\sum_{n=1}^{\infty} \frac{1}{n(n+1)}.n=1∑∞n(n+1)1.
1
0
−∞-\infty−∞
∞\infty∞
Type a concept, like “slope” or “photosynthesis”.
