Write the Series in Summation Notation $$- \frac { 1 } { 3 } + \frac { 1 } { 9 } - \frac { 1 } { 27 } + \frac { 1 } { 81 }$$

Write the series in summation notation. $$- \frac { 1 } { 3 } + \frac { 1 } { 9 } - \frac { 1 } { 27 } + \frac { 1 } { 81 }$$

A) $\sum _ { j = 1 } ^ { 4 } ( - 1 ) ^ { j + 1 } \frac { 1 } { 3 ^ { j } }$
B) $\sum _ { j = 1 } ^ { 4 } ( - 1 ) ^ { j } \frac { 1 } { 3 j }$
C) $\sum _ { j = 1 } ^ { 4 } ( - 1 ) ^ { j } \frac { 1 } { 3 ^ { j } }$
D) $\sum _ { j = 1 } ^ { 4 } ( - 1 ) ^ { j + 1 } \frac { 1 } { 3 j }$

Correct Answer:

Verified

Show Answer