2009 OIM Problems/Problem 1
Problem
Let be a natural number greater than 2. Suppose that islands are located in a circle and that between each two neighboring islands there are two bridges, with the islands in order of the clock hands. Starting on island , in how many ways can the bridges be crossed by passing over each bridge exactly once?
~translated into English by Tomas Diaz. ~orders@tomasdiaz.com
Solution
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