Use Sigma Notation to Write the Sum $$\frac { 1 } { 3 \cdot 2 } + \frac { 1 } { 4 \cdot 3 } + \cdots + \frac { 1 } { 9 \cdot 8 }$$

Multiple Choice

Use sigma notation to write the sum.
$$\frac { 1 } { 3 \cdot 2 } + \frac { 1 } { 4 \cdot 3 } + \cdots + \frac { 1 } { 9 \cdot 8 }$$

A) $\sum _ { n = 1 } ^ { 7 } \frac { 1 } { ( n + 1 ) ( n + 2 ) }$
B) $\sum _ { n = 1 } ^ { 7 } \frac { 1 } { n ( n + 1 ) }$
C) $\sum _ { n = 1 } ^ { 7 } \frac { n } { ( n + 2 ) ! }$
D) $\sum _ { n = 1 } ^ { 5 } \frac { 1 } { ( n + 1 ) ( n + 2 ) }$
E) $\sum _ { n = 0 } ^ { 6 } \frac { 1 } { ( n + 1 ) ( n + 2 ) }$