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A box contains 20 red balls and 40 green balls . Four balls are randomly selected from the box without replacement. What is the probability of selecting a red ball followed by a green ball and then another red ball followed by a green ball?

  • Math - ,

    so you want the specific order, RGRG
    prob(of that order)
    = (20/60)(40/59)(19/58)(39/57)

    = 260/5133 reduced to lowest terms
    = appr .05065

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