Saved Bookmarks
| 1. |
\frac { 1 } { 1.2 .3 } + \frac { 1 } { 2.3 .4 } + \frac { 1 } { 3.4 .5 } + \ldots + \frac { 1 } { n ( n + 1 ) ( n + 2 ) } = \frac { n ( n + 3 ) } { 4 ( n + 1 ) ( n + 2 ) } |
| Answer» | |