Mathematics, 12.12.2020 15:50 PolinaZagorodniy123

A box contains twenty-one marbles of the same size. Seven of the marbles are white, four are black, and ten are green. If two of the marbles are randomly selected from the box, what is the probability that the first marble is white and the second is green, given that
the first marble is not replaced before the second marble is selected?

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A box contains twenty-one marbles of the same size. Seven of the marbles are white, four are black,...