Saturday, April 22, 2017
Marking a Ruler
A 13-inch ruler only needs four markings on it so that it can be used to measure any whole number of inches from 1 to 13. At what positions should the four markings be? (Do not include the two ends, which are understood to be markings 0 and 13.) Click below to see the answer.
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Interesting: I found two other solutions, and I am willing to claim that that is all that there is (beyond the mirror of each, so I suppose 6 total.)
Would post here but spoilers.
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