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# A certain jar contains only "b" black marbles, "w" white

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Director
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A certain jar contains only "b" black marbles, "w" white [#permalink]  25 Apr 2006, 21:55
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A certain jar contains only "b" black marbles, "w" white marbles, and "r" red marbles. If one marble is to be chosen at random from the jar, is the porobability that the marble chosen will be red greater than the probability that the marble chosen will be white?

1). r/(b+w) > w/(b+r)

2). b-w>r

sorry if this has been asked a million times
Director
Joined: 24 Oct 2005
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A??

All B says is b > r+w.. ..

we need to know the relationship between r and w.. if r> w... or r< w.. we should be able to find the answer..
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Director
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oa is a, can you elaborate bewakoof?
Intern
Joined: 23 Feb 2006
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joemama142000 wrote:
oa is a, can you elaborate bewakoof?

It A here is the explanation:
We have:
R/(B+W)>W/(B+R) let say TOTAL(T)=R+B+W now we have:
R/(T-R)>W/(T-W) => RT-RW>WT-WR =>R>W thus R/T>R/W thus P(R)>P(W).
Intern
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I voted A too, but I kinda guessed..

"bewaqoof" hahaha nice nick. I bet you are anything but that.
Manager
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Re: gmatprep DS [#permalink]  27 Apr 2006, 09:42
joemama142000 wrote:
A certain jar contains only "b" black marbles, "w" white marbles, and "r" red marbles. If one marble is to be chosen at random from the jar, is the porobability that the marble chosen will be red greater than the probability that the marble chosen will be white?

1). r/(b+w) > w/(b+r)

2). b-w>r

sorry if this has been asked a million times

I get A as well
Re: gmatprep DS   [#permalink] 27 Apr 2006, 09:42
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