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 Post subject: Help Pls
PostPosted: Tue Dec 16, 2014 9:54 pm 
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Joined: Fri Jul 11, 2014 12:34 pm
Posts: 48
On a game show, there are 3 doors.
Behind one door, there is £1000 and behind another, there is a spider!
Behind the other door there is nothing.
Each door has a notice. However, only one notice is true.

Door 1 : There is nothing behind Door3

Door 2 : The spider is behind this door

Door 3 : There is a spider behind Door 1


Behind Which door is £1000???


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 Post subject: Re: Help Pls
PostPosted: Tue Dec 16, 2014 10:07 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11954
Think in turn about what would be implied:

Statement one was true ... there WAS nothing behind door 3 ... what does this say about the other two statements? Can they both be false?

Then repeat.


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