AMC 10 Step by Step
2009 AMC 10AProblem 9P1-10~2 minPrint

Positive integers aa , bb , and 20092009 , with a<b<2009a<b<2009 , form a geometric sequence with an integer ratio. What is aa ?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.