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Find the Sum $\sum _ { \mathrm { k } = 1 } ^ { \mathrm { n } } 5 \cdot 7 ^ { \mathrm { k } - 1 }$

Question 61

Multiple Choice

Find the sum.
- $\sum _ { \mathrm { k } = 1 } ^ { \mathrm { n } } 5 \cdot 7 ^ { \mathrm { k } - 1 }$

A) $- \frac { 5 } { 6 } \left( 1 - 7 ^ { n - 1 } \right)$

B) $- 5 \left( 1 - 7 ^ { n } \right)$

C) $- \frac { 5 } { 6 } \left( 1 - 7 ^ { n } \right)$

D) $- 30 \left( 1 - 7 ^ { n } \right)$

Find the Sum ∑k=1n5⋅7k−1\sum _ { \mathrm { k } = 1 } ^ { \mathrm { n } } 5 \cdot 7 ^ { \mathrm { k } - 1 }k=1∑n​5⋅7k−1

Multiple Choice

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Find the Sum $\sum _ { \mathrm { k } = 1 } ^ { \mathrm { n } } 5 \cdot 7 ^ { \mathrm { k } - 1 }$

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