Use Mathematical Induction to Prove the Following for Every Positive $n$

Essay

Use mathematical induction to prove the following for every positive integer $n$ .
$$\sum _ { i = 1 } ^ { n } \frac { 11 } { i ( i + 1 ) ( i + 2 ) } = \frac { 11 n ( n + 3 ) } { 4 ( n + 1 ) ( n + 2 ) }$$