SOLUTION: Hello, I am stuck with this problem and cannot seem to find any help. I need to find s6 of a geometric sequence. Given are {{{b3 = 9}}} and {{{b6= -64/3}}} I know to find the

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Question 481797: Hello, I am stuck with this problem and cannot seem to find any help.
I need to find s6 of a geometric sequence. Given are and
I know to find the sum I would need to use but for that I would need the 1st term of the sequence. I simply do not know how I can find the common ratio to find the first sequence and is not helping me there since I have 2 unknown.
Thank you a lot
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi,

geometric sequence



   = 9/r^2



         

                   r^3 = -64/27 

                     r= -4/3   and 

 

         

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