SOLUTION: a3*a8=300 Sn=128

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Question 388118: a3*a8=300 Sn=128
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
What kind of sequence is this? (Arithmetic, geometric, harmonic, ...?)
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From the given (a+2d)(a+7d) = 300. From the second info, we get %28n%2F2%29%282a%2B+%28n-1%29d%29+=+128. Three variables, two equations. Hmm. Since you chose not to give the value of n, I think you know the solution to the problem yourself. So I don't need to continue any further.