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"(1) \\( 1 + \\frac { 1 } { 3 } + \\frac { 1 } { 3 ^ { 2 } } + \\ldots + \\frac { 1 } { 3 ^ { n - 1 } } = \\frac { \\left( 1 - \\frac { 1 } { 3 ^ { n } } \\right) } { 1 - \\frac { 1 } { 2 } } \\)"

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