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Progressively Geometric (Posted on 2009-09-19) Difficulty: 2 of 5
Prove that 11, 12 and 13 can never be three terms (not necessarily consecutive) of a geometric progression, irrespective of whether the common ratio is real or complex.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
SolutionA little different solutionPraneeth2009-09-20 06:27:34
SolutionCorrected Proof (spoiler)Steve Herman2009-09-20 02:24:39
Some ThoughtsFlaw in the proposed solutionSteve Herman2009-09-20 02:17:57
possible solutionDaniel2009-09-19 21:47:49
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