AMC 10 Step by Step
2008 AMC 10BProblem 20P16-20~4 minPrint

The faces of a cubical die are marked with the numbers 11 , 22 , 22 , 33 , 33 , and 44 . The faces of another die are marked with the numbers 11 , 33 , 44 , 55 , 66 , and 88 . Both dice are thrown. What is the probability that the sum of the top two numbers will be 55 , 77 , or 99 ?

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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.