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Five white balls and two red balls are distributed between two urns A and B in...

Five white balls and two red balls are distributed between two urns A and B in such a way that urn A contains 2 white balls and 2 red balls and urn B contains 3 white balls. At each step, we draw one ball from each urn and place the ball drawn from urn A into urn B and conversely with the ball from urn B. Find the long run proportion of time that urn A will contain 4 white balls.

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