| The problem states one ruler |
| 送交者: 车五进二 2013月01月02日11:38:39 于 [灵机一动] 发送悄悄话 |
| 回 答: If you keep 3 rulers, 1, 3, 7, 由 零加一中 于 2013-01-02 11:27:42 |
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with 3 markings, NOT cut them up into 3 pieces. As I have said before, 5 total marking (including both end) can only make up to 10 different distances.
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