randmonkey randmonkey
  • 03-02-2017
  • Mathematics
contestada

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

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LammettHash
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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