Three Curtains

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rstrats

Senior Member
Aug 28, 2011
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#1
You are a contestant on a game show. There are three curtains. Behind one of the curtains is a new car. You are asked to choose one of the curtains. Lets say that you choose curtain #1. The host of the show - who knows where the car is so as not to end the game prematurely - opens curtain #3 and there is no car behind it. The host now gives you a choice. You can stay with curtain #1 or you can change your choice to curtain #2. The question now is: would it be to your advantage to stay with curtain #1, or would it be to your advantage to change to curtain #2 or would there be no advantage either way?
 

T_Laurich

Senior Member
Mar 24, 2013
3,356
122
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#2
Change to curtain number two, then you have a 66% chance of winning... keep on curtain number 1 and you only have a 33% chance of winning...

:p
 
Last edited:

rstrats

Senior Member
Aug 28, 2011
723
42
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#4
Anyone disagree with T_Laurich?
 
Sep 6, 2013
4,430
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#5
T_Laurich's post made my brain hurt. Therefore I agree with it.
 

rstrats

Senior Member
Aug 28, 2011
723
42
28
#7
breno785au,

re: "How does that work?"



What would you do if before any curtain was opened, the host told you that you could stay with #1 or switch to BOTH #2 and #3?
 

breno785au

Senior Member
Jul 23, 2013
6,002
765
113
39
Australia
#8
breno785au,

re: "How does that work?"



What would you do if before any curtain was opened, the host told you that you could stay with #1 or switch to BOTH #2 and #3?
Stick with number 1…wouldnt want to be double minded now would I? ;)hehe
 

rstrats

Senior Member
Aug 28, 2011
723
42
28
#9
breno785au,

re: "Stick with number 1…wouldnt want to be double minded now would I?"


Might there be any other reason for not switching to curtain #2?
 

crossnote

Senior Member
Nov 24, 2012
30,709
3,650
113
#10
Stick with #1. It was stated ''The host of the show - who knows where the car is so as not to end the game prematurely - "

Which means it was most likely behind #1.

If it was behind #2 he wouldn't have had to make the move to open #3.
 

crossnote

Senior Member
Nov 24, 2012
30,709
3,650
113
#11
Change to curtain number two, then you have a 66% chance of winning... keep on curtain number 1 and you only have a 33% chance of winning...

:p
This is not true. At this point all you know is that it is not behind #3. That leaves either #1 or #2. So it is a 50/50% chance with either one. But due to the above events..."The host of the show - who knows where the car is so as not to end the game prematurely..opened door #3" - ... it tips the odds to Door #1!!!
 

rstrats

Senior Member
Aug 28, 2011
723
42
28
#12
crossnote,

re: "Stick with #1. It was stated ''The host of the show - who knows where the car is so as not to end the game prematurely - ' Which means it was most likely behind #1."

Saying that the host of the show knows where the car is located is intended to mean that he won't be taking a chance in trying to open a curtain without the car.



re: "If it was behind #2 he wouldn't have had to make the move to open #3."

The OP doesn't say that he HAD to open curtain #3. If the car was behind curtain #1 he could have opened either 2 or 3.
 
D

didymos

Guest
#13
(...)The question now is: would it be to your advantage to stay with curtain #1, or would it be to your advantage to change to curtain #2 or would there be no advantage either way?
The 'Final Curtain' is all that matters to me. (Matthew 6:20) :rolleyes:
 
I

inthewind

Guest
#14
If I win the car do I have to pay taxes on it? :)
 

rstrats

Senior Member
Aug 28, 2011
723
42
28
#15
crossnote,
re: "This is not true. At this point all you know is that it is not behind #3. That leaves either #1 or #2. So it is a 50/50% chance with either one."



Anyone agree with crossnote?
 

rstrats

Senior Member
Aug 28, 2011
723
42
28
#16
inthewind,
re: "If I win the car do I have to pay taxes on it?"


Probably.