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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] New post 25 Apr 2006, 21:55
00:00
A
B
C
D
E

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  5% (low)

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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
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 [#permalink] New post 25 Apr 2006, 22:51
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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 [#permalink] New post 25 Apr 2006, 23:02
oa is a, can you elaborate bewakoof?
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 [#permalink] New post 27 Apr 2006, 06:08
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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 [#permalink] New post 27 Apr 2006, 07:53
I voted A too, but I kinda guessed.. :oops:

"bewaqoof" hahaha nice nick. I bet you are anything but that.
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Re: gmatprep DS [#permalink] New post 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 :wink:
Re: gmatprep DS   [#permalink] 27 Apr 2006, 09:42
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