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Arrow dice (Posted on 2006-03-22) Difficulty: 3 of 5
You have a six-sided die with an arrow on each face. You play a little game with the die. You place the die flat on the table. You rotate the die in the direction of the arrow on the top face. This step is repeated each time by looking at the arrow on the top face of the die. The game is over when you see the same arrow pointing in the same direction twice.

If you can choose the directions of the arrows and the starting position of the die, what is the longest this game can last?

What is the farthest the die can go from the start to the end of the game?

  Submitted by Tristan    
Rating: 3.8000 (5 votes)
Solution: (Hide)
Question 1: 21 turns
Question 2: sqrt(20) * edge of cube

Note that, given any face on the dice, the next face is actually opposite direction of the arrow.

Question 1:
+---+
| > |
+---+---+---+---+
| v | > | > | > |
+---+---+---+---+
            | v | start here
            +---+
Question 2:
+---+---+---+
| < | < | ^ |
+---+---+---+---+---+
        | < | < | ^ | start anywhere
        +---+---+---+

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Some ThoughtsPuzzle ThoughtsK Sengupta2023-03-18 04:46:09
re(2): A guesstomarken2006-03-22 22:03:53
Solutionre: A guessDej Mar2006-03-22 22:00:46
SolutionSolutionLeming2006-03-22 13:26:41
SolutionDej Mar2006-03-22 13:06:08
SolutionA guesstomarken2006-03-22 12:40:32
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