![]() Without doing the math, the answer isħ,959,229,931,520 if you count reversals or half that amount if you do not. If (n) is odd, then there are (n+1)/2 trains, eachĪ common question is how many different trains can build with a standard double six set. If (n) is even, then a circular train exists for thatĭomino set. (n+2), so it is easy to answer the train and circular train Notice that theĭegree of the nodes of a domino set graph will always be Into a train because its nodes have degree 8. Therefore, the set cannot be put into a single trainīecause its nodes have degree 5.
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