

jammen New user 10 Posts 
Puzzle: Say you have four specially marked dice. Two players each select one, and the player who rolls higher number wins. The faces are 111555, 2222,66, 333333, and 444400. You're given the first choice. Which die should you choose?
Marilyn says "I'll tell you which die is the strongest (meaning that it will score more wins when played against all other dice, and you figure out why it doesn't matter which die you choose!) The answer will appear June 29 at parade.com. Ok, ready? The strongest die is 222266.  This is a nontransitive problem. i.e. A beats B, B beats C, and C beats A. So whoever picks first loses. The 3s beat the 2's. The 4's beat the 3's. The 5's beat the 4's. And the 2's beat the 5's. Martin Gardner has a beautiful nontransitive puzzler in his wonderful "The Colossal Book of Mathematics". 
stanalger Special user St. Louis, MO 996 Posts 
Yes, if second player correctly analyzes game, that player can always pick a die that will beat your die 2/3 of the time.
So it doesn't matter which die you choose. However, if the second player simply chooses a die at random, your (first) choice of the 111555 die will give you a 1/2 probability of winning, your choice of the 222266 die will give you a 14/27 prob. of winning, your choice of the 333333 die will give you a 1/2 prob. of winning, your choice of the 444400 die will give you a 13/27 prob. of winning. Thus, if second player chooses randomly, you should choose the 222266 die, since it's the "strongest" diein the sense defined by Marilyn. I don't see any mistake in Marilyn's answer. 
jammen New user 10 Posts 
Well, the problem is clumsily worded as there is no "strongest die". If random play is assumed then it must be stated in the conditions of contest.

LobowolfXXX Inner circle La Famiglia 1192 Posts 
The mail she got after her analysis of the Monty Hall problem was hilarious.
"Torture doesn't work" lol
Guess they forgot to tell Bill Buckley. "...as we reason and love, we are able to hope. And hope enables us to resist those things that would enslave us." 
The Magic Cafe Forum Index » » Puzzle me this... » » Ask Marilyn wrong again (0 Likes) 
[ Top of Page ] 
All content & postings Copyright © 20012020 Steve Brooks. All Rights Reserved. This page was created in 0.11 seconds requiring 5 database queries. 
The views and comments expressed on The Magic Café are not necessarily those of The Magic Café, Steve Brooks, or Steve Brooks Magic. > Privacy Statement < 