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170. If \( \sum _ { r = 1 } ^ { n } I ( r ) = 3 ^ { n } - 1 , \) then \( \sum _ { r = 1 } ^ { n } \frac { 1 } { l ( r ) } \) is equal to (1) 2\( \left( 1 - \left( \frac { 1 } { 3 } \right) ^ { n } \right) \) (3) \( \quad \frac { 3 } { 4 } \left( 1 - \left( \frac { 1 } { 3 } \right) ^ { n } \right) \) (2) 3\( \left( 1 - \left( \frac { 1 } { 3 } \right) ^ { n } \right) \) (4) \( \frac { 4 } { 3 } \left( 1 - \left( \frac { 1 } { 3 } \right) ^ { n } \right) \)
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