AMC 10 Step by Step
2010 AMC 10BProblem 18P16-20~5 minPrint

Positive integers aa , bb , and cc are randomly and independently selected with replacement from the set {1,2,3,,2010}\{1, 2, 3,\dots, 2010\} . What is the probability that abc+ab+aabc + ab + a is divisible by 33 ?

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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.