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Solving a Neat Puzzle: How Many Times in a 12-Hour Period Can You Not Tell the Time?

Have you ever come across a puzzle that you can't seem to solve? This blog post discusses a neat puzzle involving a clock with identical hands and how many times in a 12-hour period you can't tell the time. Be careful not to make assumptions, as the hour hand won't always point straight up!

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Dave Richeson

Mathematician. John J. & Ann Curley Chair in Liberal Arts at Dickinson College. Author of Tales of Impossibility and Euler's Gem. Coffee drinker.