Find the indicated sum of the geometric series. ∑6k=1−3(2)k−1

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03-02-2017
Mathematics

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Find the indicated sum of the geometric series. ∑6k=1−3(2)k−1

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LammettHash LammettHash · Answer 1 · 2017-02-06T20:44:39+01:00

LammettHash LammettHash

06-02-2017

[tex]\displaystyle\sum_{k=1}^63\times2^{k-1}=3\frac{1-2^6}{1-2}=189[/tex]

Or, if that hyphen between the lower index and 3 is actually a negative sign, then the sum is -189.

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