AMC 10 Step by Step
2021 AMC 10BProblem 22P21-25~8 minPrint

Ang, Ben, and Jasmin each have 55 blocks, colored red, blue, yellow, white, and green; and there are 55 empty boxes. Each of the people randomly and independently of the other two people places one of their blocks into each box. The probability that at least one box receives 33 blocks all of the same color is mn\frac{m}{n} , where mm and nn are relatively prime positive integers. What is m+n ?m + n ?

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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.