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There are two bags, one of which contain...

There are two bags, one of which contains 3 black and 4 white balls, while the other contains 4 black and 3 white balls. A die is thrown. It shows up 1 or 3, a ball is taken from the first bag, but it shows up any other number, a ball is chosen from the second bag. Find the probability of choosing a black ball.

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