Newsgroups: sci.math
From: hoey@aic.nrl.navy.mil (Dan Hoey)
Date: 1995/05/09
Subject: Re: Combinations. Whoopee.

prax...@aol.com (Praxxix) writes:
> How many multiples of 3 between 100 and 1000 can be formed from the digits
> 1,4,5,6, and 8?
> Mike Laussade

Take an ordinary six-faced die, and change the 1, 2, and 3 to
6, 8, and 1, respectively.

Then you can read off a three-digit multiple of three by starting at
any face and reading clockwise around one of its corners.

All you need to do is figure out how many ways you can read numbers
off the die, and why this procedure gives you the right answer.

Dan
Hoey@AIC.NRL.Navy.Mil