Express the Sum Using Summation Notation with a Lower Limit $$\frac { 4 } { 5 } + \frac { 5 } { 6 } + \frac { 6 } { 7 } + \frac { 7 } { 8 } + \ldots + \frac { 17 } { 18 }$$

Multiple Choice

Express the sum using summation notation with a lower limit of summation not necessarily 1 and with k for the index of
summation.
- $$\frac { 4 } { 5 } + \frac { 5 } { 6 } + \frac { 6 } { 7 } + \frac { 7 } { 8 } + \ldots + \frac { 17 } { 18 }$$

A) $\sum _ { k = 5 } ^ { 17 } \frac { k } { k + 1 }$

B) $\sum _ { k = 4 } ^ { 17 } \frac { k + 1 } { k }$

C) $\sum _ { k = 4 } ^ { 17 } \frac { k } { k + 1 }$

D) $\sum _ { \mathrm { k } = 4 } ^ { 17 } \frac { \mathrm { k } } { \mathrm { k } \cdot 1.5 }$