MIE 2016/Day 1/Problem 10: Difference between revisions
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Latest revision as of 21:13, 10 January 2018
Problem 10
A hexagon is divided into 6 equilateral triangles. How many ways can we put the numbers from 1 to 6 in each triangle, without repetition, such that the sum of the numbers of three adjacent triangles is always a multiple of 3? Solutions obtained by rotation or reflection are differents, thus the following figures represent two distinct solutions.
(a) 
(b) 
(c) 
(d) 
(e) 
