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Can somebody help me solve this problem ? I am not so good with probability. -
A bag contains 2 green marbles and 3 white marbles. One marble is drawn at random and not replaced.
Then a second marble is drawn. What is the probability that the first marble is white and the second one
is green?

  • Math -

    Prob(white, then green)
    = (3/5)(2/4) = 3/10

    Can you tell where my numbers came from ?

  • Math -

    3/5 came from the probability of drawing White marbles. I am not sure about the (2/4)

  • Math -

    since you kept the first marble drawn, there are now only 4 left, but the 2 greens are still in there
    so 2/4 for the greens

  • Math -

    Okay , that makes sense .

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