(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The first 3 of a geometric progression are as follows:

[tex]2^{n}, 2^{n+1}, 2^{n+2}[/tex]

Find n

2. Relevant equations

For this kind of question, the only possibly helpful equation I can think of would be:

[tex]T_{1}=a[/tex]

3. The attempt at a solution

The problem I have is that at first glance I thought I couldn't find the answer to this question because there is not enough information. I know the rate of the progression and can prove it, but it seems physically impossible to find n. The answer in the book is [tex]n=\frac{1}{2}[/tex]

Am I right to assume I cannot find n or is there something I am missing? (Besides more information for the question).

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# Homework Help: Geometric sequence

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