Use the Geometric Series Formula to Find the Sum Of 1

question 16

Essay

Use the geometric series formula to find the sum of $$1 - \frac { 1 } { r } + \frac { 1 } { r ^ { 2 } } - \frac { 1 } { r ^ { 3 } } + \frac { 1 } { r ^ { 4 } } .$$

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