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More improbability

Started by En_Route, May 10, 2012, 12:50:40 AM

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En_Route

A famous three card trick. There  are inded three cards; one has two white faces, one has two red faces, one has a red face and a white face. What are the chances of a card with a red face showing also having a red face on its other side?



Some ideas are so stupid only an intellectual could believe them (Orwell).

The Magic Pudding

#1
It sounds fifty fifty, there are only two cards relevant.

But you could be looking at one of three sides.

The red side of the red/white one
One Side of the red/red
The other side of the red/red

Sounds like another tricky 66.66% thing

OldGit

It has to be 50-50, and I don't care if Einstein personally brings a different answer and tatoos it on my buttocks. 

En_Route

So what are the chances he'll choose the left buttock first?
Some ideas are so stupid only an intellectual could believe them (Orwell).

Ali



Ha! You can't fool me this time! It is 4/6 aka 66.66%. Bazinga!

Ali

WHY, WHY has no one taken the time to congratulate me on my brilliance in solving this puzzle?!?  Is it possible that you scoundrels don't realize this may well be the only "logic" question I will ever answer correctly on this board?!?  This is a once in a lifetime occurance.  Appreciate it, or I swear to Asmo I will level this place.

*long hard squinty glare at each of you*









;D

En_Route

By Jove, I think she's got it!
Some ideas are so stupid only an intellectual could believe them (Orwell).

Stevil

Congratulations Ali. So smart.

I love that you wrote all the permutations down. There were only 6 of them so it was well worth the time.

We need a graduation cap for you to throw into the air!

OldGit

I grovel, O Ali, but I still don't get it.

***********************
Now here's a good one:

There are three crows sitting on a fence.  You shoot one crow.  How many crows remain?

En_Route

Quote from: OldGit on May 11, 2012, 09:37:39 AM
I grovel, O Ali, but I still don't get it.

***********************
Now here's a good one:

There are three crows sitting on a fence.  You shoot one crow.  How many crows remain?

None if they have any sense.
Some ideas are so stupid only an intellectual could believe them (Orwell).

OldGit


The Black Jester

Quote from: Ali on May 10, 2012, 04:24:42 PM


Ha! You can't fool me this time! It is 4/6 aka 66.66%. Bazinga!

Ali,

I, too, grovel before your superior intelligence.  I have been staring at your solution and am having the worst time understanding it.  I am completely clueless, for example, as to what criteria you used to write "1" or "0" next to each permutation.  It is very possible that I am just an utter cretin and am missing what is obvious to everyone, and I apologize for asking you to spell out what seems transparent to others.  But, is there any other way you can explain it?  When I tried the original problem, I too came up with an answer of "2/3" (since, obviously, 4/6 reduces to 2/3) but only because I reasoned clumsily that of the 3 red sides, 2 belonged to the card with a red side on both, so there was a 2/3 possibility.  But I'm guessing that isn't a correct avenue to the solution.  And, please, if others besides Ali want to jump in and school this patent imbecile, please feel free to do so.
The Black Jester

"Religion is institutionalised superstition, science is institutionalised curiosity." - Tank

"Confederation of the dispossessed,
Fearing neither god nor master." - Killing Joke

http://theblackjester.wordpress.com

Asmodean

Quote from: Ecurb Noselrub on July 25, 2013, 08:18:52 PM
In Asmo's grey lump,
wrath and dark clouds gather force.
Luxembourg trembles.

Ali

Quote from: The Black Jester on May 11, 2012, 06:04:43 PM
Ali,

I, too, grovel before your superior intelligence.  I have been staring at your solution and am having the worst time understanding it.  I am completely clueless, for example, as to what criteria you used to write "1" or "0" next to each permutation.  It is very possible that I am just an utter cretin and am missing what is obvious to everyone, and I apologize for asking you to spell out what seems transparent to others.  But, is there any other way you can explain it?  When I tried the original problem, I too came up with an answer of "2/3" (since, obviously, 4/6 reduces to 2/3) but only because I reasoned clumsily that of the 3 red sides, 2 belonged to the card with a red side on both, so there was a 2/3 possibility.  But I'm guessing that isn't a correct avenue to the solution.  And, please, if others besides Ali want to jump in and school this patent imbecile, please feel free to do so.

Groveling before my superior intellect!  That I like!

1 or 0 was kind of shorthand for yes or no.  The question for each variation is "does this scenario show a card with a red face next to another card with a red face?"  1 = yes, 0 = no.  So for the first possible layout, the card that has red/red is on the left, and the card that has red/white is in the middle.  The two cards both have red and are next to each other, so that's a yes.  For the second scenario, red/red is on the left, white/white is in the middle, and red/white is on the right.  The two cards that have red on them are not next to each other (white/white is in between them) so that's a no.  There are 6 possible scenarios, and out of that, 4 of them have the two cards that feature red next to each other (marked by a 1).  Makes better sense?

OldGit

Quote from: The AsmoThe dead/injured one, I suppose?

Right, oh Asmo!  One crow remains: the dead one.  The other two flew away.  Please, nobody tell me it's 0.66 crows or I'll go MAAAAAD.