+0

# Help!

0
108
2

I don't know how to solve this, can someone help as soon as possible? Thank you!

Compute the sum:

$$\frac{2}{1\cdot2\cdot3}+\frac{2}{2\cdot3\cdot4}+\frac{2}{3\cdot4\cdot5}...$$

Guest Jun 4, 2017
Sort:

### 2+0 Answers

#1
0

The denominators follow this pattern: n^3 + 3n^2 + 2n. Therefore they all sum up to:

∑[ 2 / ( n^3 + 3 n^2 + 2 n), n, 1, 1,000,000] = 1/2.

Guest Jun 4, 2017
#2
0

Thank you so much!

Guest Jun 5, 2017

### 7 Online Users

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details