Sam has a large collection of cubes, each of which is either red or yellow. Sam makes a block from twenty-seven cubes, so that no cubes of the same colour meet face-to-face.
What is the different between the largest number of red cubes that Sam can use and the smallest number?
Select one option, then click Submit.
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Select an option, then submit.
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Senior Mathematical Challenge 2011 (2011)
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