olymmath

JMO 2016 Problem 4

    There is a 11×1111\times 11 square grid. We divided this in 55 rectangles along unit squares. How many ways that one of the rectangles doesn't have a edge on basic circumference. Note that we count as different ways that one way coincides with another way by rotating or reversing.

    Dataset text AI-MO AoPS. Quoted with source.

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