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

question 138

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) \(\sum _ { k = 5 } ^ { 17 } \frac { \mathrm { k } } { \mathrm { k } + 1 }\)
• B) \(\sum _ { k = 4 } ^ { 17 } \frac { \mathrm { k } + 1 } { \mathrm { k } }\)
• C) \(\sum _ { k = 4 } ^ { 17 } \frac { k } { k + 1 }\)
• D) \(\sum _ { \mathrm { k } = 4 } ^ { 17 } \frac { \mathrm { k } } { \mathrm { k } \cdot 1.5 }\)

---

Definitions:

Different Ages

The various stages of life characterized by distinct developmental milestones, needs, and challenges.

Longitudinal Design

A research strategy where data is collected from the same subjects repeatedly over a period of time.

Different Ages

Distinct stages in life characterized by unique physical, psychological, and social milestones.

Single Group

A group consisting of subjects who are exposed to an experimental or treatment condition, without a separate control group for comparison.