Author: Uri Blass
Date: 15:00:12 09/26/02
Go up one level in this thread
On September 26, 2002 at 17:06:21, Sune Fischer wrote: >On September 26, 2002 at 16:42:37, Uri Blass wrote: > >>On September 26, 2002 at 16:14:46, Sune Fischer wrote: >> >>>On September 26, 2002 at 15:30:42, Rolf Tueschen wrote: >>>> >>>>You are wrong because we had only one question. Was Marilyn right for the exact >>>>text of the question. I said no, because the question did not make clear that >>>>the host must _always_ open a door. >>> >>>What question are you refering too, not this one surely: >>>"Suppose you're on a game show, and you're given a choice of three doors. Behind >>>one door is a car; behind the others, goats. You pick a door-;say No. 1-;and the >>>host, who knows what's behind the doors, opens another door-;say No. 3-;which >>>has a goat. He then says to you, “Do you want to pick door No. 2?” Is it to your >>>advantage to switch your choice? " >>> >>>Not only does it say he opens a door, it also says he knows what is behind the >>>doors, and that he will open one with a goat, clearly he is all-knowing. >> >>The question says that the host knows. >>The question does not say that he always must open a door. > >Yes it does: >"the host, who knows what's behind the doors, opens another door-;say No. 3-;" This is only explanation of what happened. The only information that is clear from the question is: 1)you play on a game when you choose a door. 2)The host knows what is behind the doors. 3)The host opened a door that is the wrong door. This information is not enough to decide if you should switch doors. It is possible to understand that the host has to open a wrong door but it is not clear from the question. The question only says: "host, who knows what's behind the doors, opens another door-;say No. 3-;which has a goat" If his strategy is always to open a door is not clear from the question and the only information that we know for sure is that he opened a door. The question did not use past tense but present tense so it makes the impression that the host always opens a door so I cannot say that merilyn was wrong but it is not clear from the question so I cannot say that people who say that data is missing are wrong. Uri
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