Use Summation Notation
-$$\sum _ { i = 1 } ^ { 4 } \frac { 1 } { 7 i }$$

Question

Quizplus · Accepted Answer

The summation notation $\sum _ { i = 1 } ^ { 4 } \frac { 1 } { 7 i }$ can be expanded as $\frac{1}{7*1} + \frac{1}{7*2} + \frac{1}{7*3} + \frac{1}{7*4} = \frac{1}{7} + \frac{1}{14} + \frac{1}{21} + \frac{1}{28}$. Simplifying this gives $\frac{4}{28} + \frac{2}{28} + \frac{4}{84} + \frac{3}{84} = \frac{8 + 4 + 3}{84} = \frac{15}{84} = \frac{5}{28}$. Correcting the calculation: $\frac{1}{7} + \frac{1}{14} + \frac{1}{21} + \frac{1}{28} = \frac{12}{84} + \frac{6}{84} + \frac{4}{84} + \frac{3}{84} = \frac{25}{84}$.

Use Summation Notation - ∑i=1417i\sum _ { i = 1 } ^ { 4 } \frac { 1 } { 7 i }i=1∑4​7i1​

Use Summation Notation
- $\sum _ { i = 1 } ^ { 4 } \frac { 1 } { 7 i }$