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anonymous
 one year ago
What is the sum of a 7term geometric series if the first term is 6, the last term is 24,576, and the common ratio is 4?
−32,766
−19,662
19,662
32,766
anonymous
 one year ago
What is the sum of a 7term geometric series if the first term is 6, the last term is 24,576, and the common ratio is 4? −32,766 −19,662 19,662 32,766

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jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1\[\Large S_n = a*\frac{1r^n}{1r}\] Plug in a = 6 (first term) r = 4 (common ratio) n = 7 (number of terms)

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1I think you meant this right? \[\Large 6*\frac{14^7}{14}\]

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1compute that with a calculator

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1make sure you use parenthesis

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0will you check this one? @jim_thompson5910

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What is the sum of the geometric sequence 1, −6, 36, … if there are 7 terms? −39,991 −6,665 6,665 39,991 x this one?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1Yep \[\Large S_n = a*\frac{1r^n}{1r}\] \[\Large S_7 = 1*\frac{1(6)^7}{1(6)}\] \[\Large S_7 = 39,991\]
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