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# A jar contains two red marbles, three blue marbles, and four

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Intern
Joined: 23 May 2008
Posts: 47
A jar contains two red marbles, three blue marbles, and four [#permalink]

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08 Sep 2008, 14:57
A jar contains two red marbles, three blue marbles, and four green
marbles. Niki draws one marble from the jar, and then Tom draws a
marble from those remaining. What is the probablity that Niki draws a
green marble and Tom draws a blue marble? Express your answer as a
common fraction. (http://mathforum.org/library/drmath/view/56491.html)

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Senior Manager
Joined: 09 Oct 2007
Posts: 456

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08 Sep 2008, 15:14
(Green/Total)(Blue/Total-1) = (4/9)(3/8) = 1/3*2 = 1/6
Intern
Joined: 23 May 2008
Posts: 47

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08 Sep 2008, 15:41
Thank you asdert. How does this account for the possibility that Niki may or may not have picked a green marble?

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This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: Marbles   [#permalink] 08 Sep 2008, 15:41
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# A jar contains two red marbles, three blue marbles, and four

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