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There are \(n\) balls in the box. There are only black or white balls in the box. The number of white balls is unknown. Assume that that any number of white balls is equiprobable and find a probability to take a white ball from the box at the second time if the first ball that was taken is white. Balls are taken from the box randomly.
 one year ago
 one year ago
There are \(n\) balls in the box. There are only black or white balls in the box. The number of white balls is unknown. Assume that that any number of white balls is equiprobable and find a probability to take a white ball from the box at the second time if the first ball that was taken is white. Balls are taken from the box randomly.
 one year ago
 one year ago

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satellite73Best ResponseYou've already chosen the best response.0
oh maybe there is a different question this time? the set up is the same, but there is no question here
 one year ago

klimenkovBest ResponseYou've already chosen the best response.0
"... find a probability to take a white ball from the box at the second time..."
 one year ago

satellite73Best ResponseYou've already chosen the best response.0
aaaah i thought maybe something different. no replacement i assume, and we don't know the first ball right?
 one year ago

satellite73Best ResponseYou've already chosen the best response.0
what do you want to bet it is one half?
 one year ago

estudierBest ResponseYou've already chosen the best response.0
I really don't see how anyone is supposed to come up with a sensible answer to this....
 one year ago

klimenkovBest ResponseYou've already chosen the best response.0
"...the first ball that was taken is white...find a probability to take a white ball from the box at the second time..."
 one year ago

estudierBest ResponseYou've already chosen the best response.0
I repeat "I really don't see how...." :)
 one year ago

klimenkovBest ResponseYou've already chosen the best response.0
What about http://en.wikipedia.org/wiki/Bayes%27_theorem
 one year ago

klimenkovBest ResponseYou've already chosen the best response.0
Do you know where to use this theorem in general?
 one year ago

estudierBest ResponseYou've already chosen the best response.0
I might use Bayesian inference if I had some idea of the percentage of white balls to start with....
 one year ago

klimenkovBest ResponseYou've already chosen the best response.0
Do you know the formula of total probability?
 one year ago

estudierBest ResponseYou've already chosen the best response.0
U mean this http://en.wikipedia.org/wiki/Law_of_total_probability
 one year ago

estudierBest ResponseYou've already chosen the best response.0
The problem here is that there is insufficient data on which to base any answer to the question.
 one year ago

CliffSedgeBest ResponseYou've already chosen the best response.0
Any number of white balls is equiprobable, but what about the number of black balls? Is the number of black balls known? Can't find a numerical answer here, but I suspect an algebraic expression at least is possible.
 one year ago

mahmit2012Best ResponseYou've already chosen the best response.0
dw:1351374001717:dw
 one year ago

klimenkovBest ResponseYou've already chosen the best response.0
No. There is a numerical answer. Like in this http://openstudy.com/users/klimenkov#/updates/5083d8ade4b0dab2a5ec3294
 one year ago
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