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anonymous
 one year ago
Find S8 for the series 2 + 10 + 50 + 250 +...
i got 781248
anonymous
 one year ago
Find S8 for the series 2 + 10 + 50 + 250 +... i got 781248

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Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1it is a geometric sequence whose constant is q=5 and first term is a1=2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay. and i plug it to the formula and got 781248

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1we have to apply this formula: \[\Large {S_8} = {a_1}\frac{{1  {q^8}}}{{1  q}} = 1 \cdot \frac{{1  {5^8}}}{{1  5}} = ...?\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0no wait it shud be 195312

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0a1 should be 2 not 1

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1oops.. \[\Large {S_8} = {a_1}\frac{{1  {q^8}}}{{1  q}} = \left( {  2} \right) \cdot \frac{{1  {5^8}}}{{1  5}} = ...?\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so did i get the right anwser?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1it is 195312 since you are summing all negative terms
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