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# GMAT Prep - DS Probability

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Intern
Joined: 04 Jun 2008
Posts: 18
Location: Delhi, India
GMAT Prep - DS Probability [#permalink]

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30 Jun 2008, 21:30
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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Please explain solution for this question.
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_________________

-Albert
My GMAT Preparation: http://albertrahul.blogspot.com/search/label/GMAT

Director
Joined: 23 Sep 2007
Posts: 782
Re: GMAT Prep - DS Probability [#permalink]

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30 Jun 2008, 22:49
E

We need to find the actual number of balls of each color and/or odd/even.

statement 1 is obviously not enough because it does not give the number of white balls

statement 2 is not enough because you can have (10 white balls) - (5 evens) = 6 OR 15 white balls - 10 evens = 5 (which is 20%)

Put them together, still not enough to solve because we still don't know how many white balls there are.
Manager
Joined: 11 Apr 2008
Posts: 154
Schools: Kellogg(A), Wharton(W), Columbia(D)
Re: GMAT Prep - DS Probability [#permalink]

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30 Jun 2008, 23:16
I would guess E but I am not really sure of any method to get around this. I would appreciate if someone could make a detailed explanation.
Intern
Joined: 14 Apr 2008
Posts: 4
Re: GMAT Prep - DS Probability [#permalink]

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02 Jul 2008, 08:49

Not sure of the explanation, if the answer is C, then I will post my explation...

Thanks
Director
Joined: 01 Jan 2008
Posts: 622
Re: GMAT Prep - DS Probability [#permalink]

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02 Jul 2008, 09:09

question: what's the combined number of white balls and balls with even numbers = #(white) + #(even) - #(white and even)

1) there are not white balls with even numbers (#white and even) = 0
2) the number of white balls is the number of even numbers + 5: #(white) = #(even) + 5

1&2: insufficient #white = 6, #even = 1 or #white = 7 and # even = 2
Intern
Joined: 04 Jun 2008
Posts: 18
Location: Delhi, India
Re: GMAT Prep - DS Probability [#permalink]

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02 Jul 2008, 09:50
OA is E.
Thank you all for explanation.
_________________

-Albert
My GMAT Preparation: http://albertrahul.blogspot.com/search/label/GMAT

Re: GMAT Prep - DS Probability   [#permalink] 02 Jul 2008, 09:50
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