Logic puzzle
I've stolen this simple one, so no googling allowed:
There are three logicians who are able to reason and deduce with perfect accuracy, their names are A, B, and C. They each know this as well. In a bag there are seven colored stickers. Two yellow, two red, and three green. The logicians know that too. Each logician reaches into the bag, grabs one sticker and slaps it on his forehead without looking to see what color it is. Any one logician is able to see the stickers on his compatriot's heads, but not the sticker on his own.
Jerry the interrogator asks logician A if he knows what color sticker is definitely not on his forehead.
"No.", A responds. Jerry asks logician B the same question, and receives the same answer.
Why must logician Cs sticker be green?
Replies to This Discussion
-
Permalink Reply by James Mills on -
because all foreheads have the three green stickers
-
Permalink Reply by Akshay Bist on -
Can Jerry see the logicians? Did Jerry deduce that C has a green colored sticker after questioning A & B?
-
Permalink Reply by oneinfinity on -
because if C were red and A said no, then B knows that their color cannot be red, because if B and C were red then A would be able to say that their color was not red.
if C were yellow and A said no, then B knows their color isn't yellow.
if C were green and A said no, then B cannot make a determination. Therefore, C must be green.
-
Permalink Reply by James Mills on
-
a la Vizzini from the Princess Bride :-P
-
Permalink Reply by oneinfinity on
-
It's been many years since I've seen that, is this problem something from that movie?
-
Permalink Reply by James Mills on
-
i would say it's a problem worthy of a Sicilian!
-
Permalink Reply by Matthew G. Sparks on -
James I don't even know who you are but you are my favorite person right now :)
-
Permalink Reply by oneinfinity on
-
oatmeal-peanut butter-chocolate chip please :)
-
Permalink Reply by oneinfinity on
-
woot!
What's new today
Events
Forum
Is your trust in science based on faith or based on science?
Started by G in Ethics & Morals. Last reply by Pope OoO (Out of Order) 13 minutes ago. 366 Replies 0 Likes
Blog Posts
Christian Man Claims Native American Statue On License Plate Violates His Freedom Of Religion, Sues Oklahoma
Posted by Rob Klaers on June 17, 2013 at 2:00am 5 Comments 3 Likes
Videos
The Latest Giz Gad
Services we love
Check out our new mobile/tablet version of Think Atheist! www.ThinkAtheist.com/m
© 2013 Created by Morgan Matthew.
