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# GMATprep practice question:probability

Author Message
Manager
Joined: 05 Jan 2009
Posts: 81
Followers: 1

Kudos [?]: 116 [0], given: 2

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25 Apr 2009, 16:28
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

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Can somebody please solve it, showing steps?
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Manager
Joined: 05 Jan 2009
Posts: 81
Followers: 1

Kudos [?]: 116 [0], given: 2

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26 Apr 2009, 13:13
Can you please explain how did you get E?
SVP
Joined: 17 Jun 2008
Posts: 1553
Followers: 11

Kudos [?]: 263 [0], given: 0

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28 Apr 2009, 02:54
If E is the event of picking a ball with even number and W is the event of picking a ball with white color, then p(WUE) is required.

From stmt1: p(W intersection E) is 0.
Hence, p(WUE) = p(W) + p(E).....insufficient.

From stmt2: p(W) - p(E) = 0.2....again, with this, it is not possible to get p(W) + p(E). Hence, answer should be E.
Re: GMATprep practice question:probability   [#permalink] 28 Apr 2009, 02:54
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