Write the word or phrase that best completes each statement or answers the question.
Use mathematical induction to prove the following statement for all positive integers n.
-$$1 + \frac { 1 } { 5 } + \frac { 1 } { 5 ^ { 2 } } + \ldots + \frac { 1 } { 5 ^ { n - 1 } } = \frac { 5 } { 4 } \left( 1 - \frac { 1 } { 5 ^ { n } } \right)$$

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The Answer of Write the word or phrase that best completes each statement or answers the question.
Use mathematical induction to prove the following statement for all positive integers n.
-$$1 + \frac { 1 } { 5 } + \frac { 1 } { 5 ^ { 2 } } + \ldots + \frac { 1 } { 5 ^ { n - 1 } } = \frac { 5 } { 4 } \left( 1 - \frac { 1 } { 5 ^ { n } } \right)$$

Write the Word or Phrase That Best Completes Each Statement