SOLUTION: Find the sum indicated for each of the geometric series listed 16 - 8 + 4 - ..., find S7

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Question 412079: Find the sum indicated for each of the geometric series listed
16 - 8 + 4 - ..., find S7
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

Geometric Series: {16,-8,4 ...} r = -.5  

sum%28+a%5Bi%5D%2C+i=1%2C+7%29 = a(1-r^7)/(1-r)= 16*1.0078125/1.5 = 10.75