Use Summation Notation
-$$3 + \frac { 7 } { 2 } + 4 + \frac { 9 } { 2 } + \ldots + 10$$
A) $\sum _ { k = 6 } ^ { 20 } \frac { k } { 2 }$
B) $\sum _ { \mathrm { k } = 1 } ^ { 20 } \frac { \mathrm { k } } { 2 }$
C) $\sum _ { \mathrm { k } = 6 } ^ { 10 } \frac { \mathrm { k } } { 2 }$
D) $\sum _ { k = 2 } ^ { 20 } \frac { k } { 2 }$

Question

Quizplus · Accepted Answer

The sequence starts at 3, which is $\frac{6}{2}$, and ends at 10, which is $\frac{20}{2}$. Therefore, the correct summation notation is $\sum _ { k = 6 } ^ { 20 } \frac { k } { 2 }$, which represents the sequence correctly by starting at $k=6$ and ending at $k=20$, incrementing by 1 each time, which captures both the whole numbers and the fractions in the sequence.

Use Summation Notation - 3+72+4+92+…+103 + \frac { 7 } { 2 } + 4 + \frac { 9 } { 2 } + \ldots + 103+27​+4+29​+…+10

Use Summation Notation
- $3 + \frac { 7 } { 2 } + 4 + \frac { 9 } { 2 } + \ldots + 10$