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AMO 2020 – Primary 5 (Grade 5) Question 25

AMO · AMO 2020 – Primary 5 (Grade 5)

Question 25

An eight-sided die has the numbers 1 through 8, once each, with opposite faces summing to 9. Roll it twice and multiply the two top numbers. How many ordered outcomes give a perfect-square product? The first and second rolls are distinguished.

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