All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Probability
Custom Dice (Posted on 2006-11-16) Difficulty: 2 of 5
You are given blank six-sided dice, with equal weight on each side (fair dice). You're allowed to write on each side of each die a number between 0 and 6. Numbers may repeat themselves on a single die, so for example, one die can have five 4s and one 0.

1) Can you create two such dice which, if they are rolled and their results added, will give equal odds for every number from 1 to 12?

2) Can you create three such dice which, if they are rolled and their results added, will give equal odds for every number from 1 to 18?

(NOTE: Don't get smart and make all the dice all 0s. The probability of getting 0 should be 0)

No Solution Yet Submitted by TamTam    
Rating: 4.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution re: Extension to question 2 | Comment 5 of 6 |
(In reply to Extension to question 2 by Joel)

Using a technique from Renumbered Dice, I find 6 sets of integer dice:

{9,9,9,0,0,0},{2,2,1,1,0,0},{7,7,4,4,1,1}
{9,9,9,0,0,0},{3,3,2,2,1,1},{6,6,3,3,0,0}
{10,10,10,1,1,1},{2,2,1,1,0,0},{6,6,3,3,0,0}
{1,1,1,0,0,0},{4,4,2,2,0,0},{13,13,7,7,1,1}
{1,1,1,0,0,0},{5,5,3,3,1,1},{12,12,6,6,0,0}
{2,2,2,1,1,1},{4,4,2,2,0,0},{12,12,6,6,0,0}

These come from the nonnegative factorizations of the generating function (the coefficient 12 comes from 216 possible rolls/18 possible values = 12 ways for each possibility)
12*(x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12+x^13+x^14+x^15+x^16+x^17+x^18)

  Posted by Brian Smith on 2017-02-27 12:56:16
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (0)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information