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again?

"... find a probability to take a white ball from the box at the second time..."

what do you want to bet it is one half?

I really don't see how anyone is supposed to come up with a sensible answer to this....

I repeat "I really don't see how...." :-)

What about http://en.wikipedia.org/wiki/Bayes%27_theorem

How does that help?

Do you know where to use this theorem in general?

I might use Bayesian inference if I had some idea of the percentage of white balls to start with....

Do you know the formula of total probability?

U mean this
http://en.wikipedia.org/wiki/Law_of_total_probability

The problem here is that there is insufficient data on which to base any answer to the question.

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