MathDB
Number of ways

Source: Tournament of Towns,Spring 2002, Senior O Level, P4

May 14, 2014
geometryrectanglecombinatorics proposedcombinatorics

Problem Statement

In how many ways can we place the numbers from 11 to 100100 in a 2×502\times 50 rectangle (divided into 100100 unit squares) so that any two consecutive numbers are always placed in squares with a common side?
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