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Math Help - Probablilty-with marbles!

  1. #1
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    Probablilty-with marbles!



    A jar contains 3 blue, 4 green, and 5 yellow marbles. if a set of three marbles is chosen at random from the jar, find the probablilty that your selectiona contains:


    a) at least 1 blue marble.


    Okay nvm. i got it.
    thank you in advance.
    Last edited by questiongirl; March 25th 2010 at 05:46 PM. Reason: Removed excessive !'s
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  2. #2
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    What have you tried?
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  3. #3
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    Quote Originally Posted by questiongirl View Post


    A jar contains 3 blue, 4 green, and 5 yellow marbles. if a set of three marbles is chosen at random from the jar, find the probablilty that your selectiona contains:

    a) 3 marbles, not all of which are blue
    b) 1 marble of each color
    c) at least 1 blue marble.

    thank you in advance!
    Try drawing a tree diagram.
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  4. #4
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    of course i have tried.but not the tree diagram.. im actually having more diffculty in at least 1 blue marble.
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