a really cool maths problem!
Suppose you’re on a game show, and you’re given the 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?
of course I said it’s 50/50. What do you think?
Here is why I was wrong:
http://en.wikipedia.org/wiki/Monty_Hall_problem#Why_the_probability_is_not_1.2F2
hi hi! It tickles my brain alright!
I went to Jena in Germany last week to try a new microscope at the headquarters of Carl Zeiss, one of the biggest microscope manufacturers. It was pretty cool (snowing actually but really hot in the room where we worked in the dark for two days). Zeiss used to employ 62000 people there in the 60s!! now only 12000…
puss puss! (as they say here)
ben voilach! c'est tout con mais faut quand meme se gratter la tete un peu!
Plus clair :
Tu prends la porte 1 :
Solution 1 : c'est la porte 1, tu perds en échangeant
Solution 2 : c'est la porte 2, tu gagnes en échangeant
Solution 3 : c'est la porte 3, tu gagnes en échangeant
Donc, 2 chances sur 3 de gagner.
Plus clair :
Tu prends la porte 1 :
Solution 1 : c'est la porte 1, tu perds en échangeant
Solution 2 : c'est la porte 2, tu gagnes en échangeant
Solution 3 : c'est la porte 3, tu gagnes en échangeant
Donc, 2 chances sur 3 de gagner.
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