There are ten urns of which each of three contains 1 white and 9 black balls; each of other three contains 9 white and 1 black balls, and of the remaining four each contains 5 white and 5 black balls. One of the urns is selected at random and a ball taken blindly from it and it turns out to be white. What is the probability that an urn containing 1 white and 9 black balls was selected?

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Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.