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A jar contains b black, r red and w white marbles. If a

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A jar contains b black, r red and w white marbles. If a [#permalink] New post 07 Jun 2007, 10:48
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A jar contains b black, r red and w white marbles. If a marble is selected randomly from the jar, is the probability that it is a red marble greater than the probability that it is a white marble?
(1) r/(b+w) > w/(b+r)
(2) b-w>r
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 [#permalink] New post 07 Jun 2007, 12:09
A.

S1. Since all the numbers are positive. And b is a constant.
S2. No relation between r and w is clear here.
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 [#permalink] New post 07 Jun 2007, 16:20
Can we be sure that there is a positive number of black marbles? Could b=0 ? They never really specify in the question.
  [#permalink] 07 Jun 2007, 16:20
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