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kobenichan
 one year ago
Find the sum of a finite geometric sequence from n = 1 to n = 6, using the expression −2(5)^(n − 1).
kobenichan
 one year ago
Find the sum of a finite geometric sequence from n = 1 to n = 6, using the expression −2(5)^(n − 1).

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kobenichan
 one year ago
Best ResponseYou've already chosen the best response.1I know you're supposed to use Sn= a1  an(r) / 1r, and I had a1=2 and an (or a6) = 6250. But when I tried to solve I didnt get any of my multiple choice answers.

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1formula is \[\huge\rm s_n = \frac{ a_1(1r^n )}{ 1r }\] where r is common ratio n is number of terms

kobenichan
 one year ago
Best ResponseYou've already chosen the best response.1Oh I must've gotten the wrong formula :( So r is 5 and n is 6, right?

kobenichan
 one year ago
Best ResponseYou've already chosen the best response.1Oh I got it now. Thank you! :)
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