Henry Ernest Dudeney/Puzzles and Curious Problems/309 - Domino Sequences/Solution

by : $309$

 * Domino Sequences

Solution
Remove from the set the four dominoes:
 * $7 - 6$, $5 - 4$, $3 - 2$, $1 - 0$.

The remaining dominoes can be put together in proper sequence.

Any other combinations of these particular numbers will also do as well, for example:
 * $7 - 0$, $6 - 1$, $5 - 2$, $4 - 3$

Generally, for any set of dominoes ending in a double odd number, those removed must contain together every number once from blank to two less than the highest number in the set.