olymmath

CZ-SK-MO 2014 Problem 3

    Suppose we have a 8×88\times8 chessboard. Each edge have a number, corresponding to number of possibilities of dividing this chessboard into 1×21\times2 domino pieces, such that this edge is part of this division. Find out the last digit of the sum of all these numbers.

    (Day 1, 3rd problem author: Michal Rolínek)

    Dataset text AI-MO AoPS. Quoted with source.

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