Mathematics, 16.07.2019 20:30, Trup1822

Box a contains 2 black marbles and 1 white marble. box b contains 1 black marble and 1 white marble. a marble is randomly selected from box a and put into box b. then a marble is randomly selected from box b and put into box a. after all this, what is the expected number of black marbles in box a?

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Box a contains 2 black marbles and 1 white marble. box b contains 1 black marble and 1 white marble....