AMC 10 Step by Step
2011 AMC 10BProblem 13P11-15~2 minPrint

Two real numbers are selected independently at random from the interval [20,10][-20, 10] . What is the probability that the product of those numbers is greater than zero?

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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.