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A regular octahedron has sides numbered 1, 3, 5, 7, 9, 10, 11, 12. Another regular octahedron has sides numbered 2, 4, 6, 8, 9, 10, 11, 12. These are thrown together.  What is the probability that the sum of the top faces is a prime?

 Oct 5, 2020

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