11. Is it possible to lay out all 28 dominoes in a chain according to the rules of the game so that a "six" ends up on one end and a "five" on the other?
11. According to the rules of the domino game, all "sixes," except for the double, are placed in pairs in the chain, unless they are at the end. If a "six" is at the end, one "six" will remain without a pair, which means it will also be at the end. Answer: no.

69 Fundamentals of the Deductive Method