Math Olympiad for Elementary | 2019 | Division E | Contest 5 | MOEMS | 5E

Problems: There is an octahedral (8-faces) die whose faces each have one different number from the set {1, 2, 3, 4, 5, 6, 7, 8}. The die is rolled twice, and the number appearing on top after the first roll is multiplied by the number appearing on top after the second roll. What is the probability that this product is divisible by 9?

Key: Make a list.

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