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Geometric sequence question? - Yahoo! Answers

I have posted a link there to this topic so the OP can find my response.

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The first term of a geometric sequence is 27 and the sixth term is 512/9.

1) Find the seventh term

I have problem with this working. Either the calculator is pulling a false one on me or IDK.

Since 512/9 = 27r^(6-1)

then (512/9) / 27 = r^5

r^5=512/243

r= (512/243) ^ 1/5

What I got for r was 0.421399177

To arrive at the seventh term; 27(0.421399177)^(7-1). I got 0.15119

This is no where close to the answer but apparently there doesn't appear to be any anomalies with my workings.

2) Find the sum of the first five terms of this sequence.

I need explanations behind the workings. Thanks!

Geometric sequence question? - Yahoo! Answers

I have posted a link there to this topic so the OP can find my response.

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