AMC 10 Step by Step
2023 AMC 10BProblem 19P16-20~4 minPrint

Sonya the frog chooses a point uniformly at random lying within the square [0,6][0, 6] ×\times [0,6][0, 6] in the coordinate plane and hops to that point. She then randomly chooses a distance uniformly at random from [0,1][0, 1] and a direction uniformly at random from {north, south, east, west}. All her choices are independent. She now hops the distance in the chosen direction. What is the probability that she lands outside the square?

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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.