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Mathematics, 17.04.2021 03:30 organicmemez

What is the sum of the first seven terms of the geometric series 3 βˆ’ 6 + 12 βˆ’ . . . ? Hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r β‰  1, where a1 is the first term and r is the common ratio. (4 points)

S7 = βˆ’63
S7 = βˆ’9
S7 = 33
S7 = 129

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