Little riddle: if you have two dice (so each has 6 sides), with 1 digit on each side and you want to be able to form all numbers between 1 and 31 (for the days of the month), what digits would be on each dice? E.g. if dice #1 has 0-1-2-3-4-5 and the second 4-5-6-7-8-9, it won’t work, because you cannot form the number ’22’.
Try to guess and I’ll give the answer next week. There’s a little trick involved! I first tried to figure it out without looking at the dice, and I enjoyed the mind gymnastics.
2007-09-28 at 11:17 pm
Got it ! But I won’t tell, otherwise I will spoil it for others :-/
2007-09-28 at 11:27 pm
Not that hard, is it?
2007-09-29 at 10:14 am
out of my head!
2007-09-29 at 10:18 am
(for the non-Dutch speakers… I meant: “done it without looking at dice and without writing anything down”)
2007-09-29 at 11:01 am
Not that hard, but indeed fun to play with. Thanks 😉
2007-09-29 at 11:08 am
Hmm, one question though: is it allowed to leave dice out from time to time? Because I could have a problem in the first 10 days 😉
2007-09-29 at 4:04 pm
@Clopin: I struggled with that too, but the riddle says “1 to 31”, so I assumed it was okay to represent the first 9 days using 1 dice.
2007-09-29 at 7:22 pm
@Clopin and @Inferis:
No, you need to have two dice, otherwise it wouldn’t be much fun…
So: you need to have “0” on one or both dices.
Oh, and may I point out that the digits are Arabic, and not represented by numbers of dots?
2007-09-30 at 12:34 am
sorry 123456 and 789120
2007-09-30 at 10:41 am
@Jan
That would be the Clopin-Inferis way of doing it.
You can’t form “07”, “08” and “09” with your solution.
2007-10-01 at 12:02 pm
It’s still not that hard then. 🙂
2007-10-02 at 1:34 pm
Hint: you will need two 0s, two 1s and two 2s.
2007-10-12 at 7:37 pm
The 9 is there all along its just hidding.
😉
2016-08-30 at 8:31 am
Now here u spill the beans 🙂
2007-10-16 at 7:51 pm
*spoiler warning*
I think I got it right. (:
Dice A: zero-one-two-three-seven-eight
Dice B: zero-one-two-four-five-six
The six can be used as a nine as well.
2008-02-06 at 1:54 am
With the 123456 and 789120 solution, the 1 in either die can be used as a “dash” so that two die could still be used to represent the first 9 days. That is: -1, -2, -3, etc.
2009-05-07 at 6:48 am
Dice 1 : 0 1 2 3 4 5
Dice 2 : 0 1 2 6 7 8
This is exact solution for this question..
2016-03-03 at 5:00 am
How to show
09
2016-03-26 at 11:21 am
where is 9?
How would be form 09 , 19 and 29?
2016-03-26 at 11:22 am
oh got it
2016-06-09 at 3:58 am
Flip the sox to form a 9.
2016-08-23 at 9:26 pm
Also works is…
0 1 2 4 5 7
0 1 2 3 8 9 (9 is also 6)
2016-12-19 at 5:59 pm
If on both dice 0 appears then what ???