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    lionel messi's Avatar
    lionel messi Posts: 35, Reputation: 1
    Junior Member
    		  
    #1

    Jul 19, 2012, 12:21 AM
    probability help..
    A jar contains 5 red and 8 blue marbles. If 3 marbles are selected at random, what is the probability that two are red and one is blue or that one is red and two are blue?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jul 19, 2012, 02:54 AM
    Post your attempt at the question please.
    teacherjenn4's Avatar
    teacherjenn4 Posts: 4,005, Reputation: 468
    Education Expert
    		  
    #3

    Jul 19, 2012, 08:03 AM
    Tell me what work you have done on this so far.
    lionel messi's Avatar
    lionel messi Posts: 35, Reputation: 1
    Junior Member
    		  
    #4

    Jul 19, 2012, 10:21 PM
    P(A)= [(5C2x8C1)+(5C1x8C2)] / 13C3..
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #5

    Jul 20, 2012, 05:31 AM
    Yup! :)
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