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

question 1

Multiple Choice

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) \(\sum _ { j = 1 } ^ { 4 } ( - 1 ) ^ { j + 1 } \frac { 1 } { 3 j }\)

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