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

Essay

Use mathematical induction to prove the following for every positive integer $n$ .
$$\sum _ { i = 1 } ^ { n } \frac { 8 } { ( 2 i - 1 ) ( 2 i + 1 ) } = \frac { 8 n } { 2 n + 1 }$$
Evaluate: ${ } _ { 8 } P _ { 5 }$
A) 56
B) 336
C) 6720
D) 40
E) undefined