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Find the Sum k=13(23)k+1\sum _ { \mathrm { k } = 1 } ^ { 3 } \left( \frac { 2 } { 3 } \right) ^ { \mathrm { k } + 1 }

question 59

Multiple Choice

Find the sum.
- k=13(23) k+1\sum _ { \mathrm { k } = 1 } ^ { 3 } \left( \frac { 2 } { 3 } \right) ^ { \mathrm { k } + 1 }


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