Express the Sum Using Summation Notation $$\frac { 3 } { 4 } + \frac { 4 } { 5 } + \frac { 5 } { 6 } + \frac { 6 } { 7 } + \ldots + \frac { 17 } { 18 }$$

Multiple Choice

Express the sum using summation notation. Use a lower limit of summation not necessarily 1 and k for the index of summation.
- $$\frac { 3 } { 4 } + \frac { 4 } { 5 } + \frac { 5 } { 6 } + \frac { 6 } { 7 } + \ldots + \frac { 17 } { 18 }$$

A) $\sum _ { k = 3 } ^ { 17 } \frac { k } { k + 1 }$
B) $\sum _ { k = 4 } ^ { 17 } \frac { \mathrm { k } + 1 } { \mathrm { k } }$
C) $\sum _ { \mathrm { k } = 3 } ^ { 17 } \frac { \mathrm { k } + 1 } { \mathrm { k } }$
D) $\sum _ { k = 4 } ^ { 17 } \frac { \mathrm { k } } { \mathrm { k } + 1 }$