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Posted by on Wednesday, November 16, 2011 at 1:24pm.

An urn contains 5 red marbles, 4 blue marbles, and 3 green marbles. A marble is selected at random and then, without replacing the first marble, a second marble is selected at random. What is the probability of selecting a green marble and then a red marble?

  • math - , Thursday, November 17, 2011 at 1:36pm

    Green = 3/12

    Red = 5/11, because one green marble has already been picked.

    The probability of both/all events occurring if found by multiplying the probabilities of the individual events.

  • math - , Tuesday, September 16, 2014 at 8:15am


  • math - , Wednesday, December 10, 2014 at 3:12pm

    Solve this problem.

    A bag contains 5 red marbles, 7 green marbles, and 3 orange marbles. Find the probability of drawing a red marble.

  • math - , Wednesday, April 15, 2015 at 7:55pm

    Li rolls a number cube that has sides labeled 1 to 6 and then flips a coin . What is the probability that she rolls an odd number and flips tail is it 1/8 or 1/4 or 1/2 or 3/4

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