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# A certain jar contains only b black marbles

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Joined: 18 May 2008
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A certain jar contains only b black marbles [#permalink]  11 Nov 2008, 03:03
Kindly explain the answer
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Re: GMATPREP probability [#permalink]  11 Nov 2008, 03:07
Probability of red marble = r/(b+r+w)
Probability of white marble = w/(b+r+w)

We need to find whether r > w.

From stmt1: r/(b+w) + 1 > w/(b+r) + 1
or, (r+b+w)/(b+w) > (r+b+w)/(b+r)
or, b+w < b+r
or, w < r....sufficient to answer the question.
Re: GMATPREP probability   [#permalink] 11 Nov 2008, 03:07
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# A certain jar contains only b black marbles

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