A bag contains either a white marble or a black marble. Your challenge is to correctly identify the statistics at play.
Don’t be deceived by the simple setup. This puzzle is famous for defying people’s intuitions. If you struggle to crack it, think it over while falling asleep tonight. It might at least quell your worries.
We will post the solution next Monday along with a new puzzle. Do you know a great puzzle that you think we should cover here? Send it to us: [email protected] you to design a functioning pair of calendar cubes. Remember, a cube only has six faces. Every month has an 11th and a 22nd day, so the digits 1 and 2 must appear on both cubes, or else these days couldn’t be rendered. Notice that both cubes also need a 0.
There are two natural extensions of the calendar cube puzzle to other date information. Amazingly, this theme of hair’s breadth efficiency persists across them. What if we want to add a cube that represents the day of the week? Tuesday and Thursday begin with the same letter, so we need to allow two letters on a single cube face to distinguish them: ‘Tu’ and ‘Th’. Likewise with Saturday and Sunday, which we’ll represent with ‘Sa’ and ‘Su’.
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