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# My apologies (again) if this is a re-post: It's a

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Intern
Joined: 30 Nov 2006
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My apologies (again) if this is a re-post: It's a [#permalink]

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04 Jun 2007, 12:13
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This topic is locked. If you want to discuss this question please re-post it in the respective forum.

My apologies (again) if this is a re-post:
It's a probability question, please refer to the attachment,
Attachments

PS - Probability.JPG [ 34.68 KiB | Viewed 625 times ]

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Manager
Joined: 14 Mar 2007
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04 Jun 2007, 12:23
harddddddddddd!!!!

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Intern
Joined: 02 Jun 2007
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04 Jun 2007, 15:54
E

Basic Formula:
P(white or even) = P(white) + P(even) - P(white and even)

1) Tells us P(white and even) = 0. But we know nothing about the first two terms. Not suff.
2) Tells us P(w) - P(e) = 0.2. Still not helpful, since we don't know P(w&e). Not suff.

1 & 2) We know P(w) - P(e) and P(w&e)=0. So we need to figure out what P(white) + P(even) is. We can't. Not suff.

Case 1: 15 white balls, and 10 even
Case 2: 10 white balls, and 5 even

In both cases, p(w)-p(e) = 0.2, but p(w or e) is different.

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Intern
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04 Jun 2007, 15:58
Bravo
E it is!!!

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Director
Joined: 14 Jan 2007
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05 Jun 2007, 07:45
E for me too.
Nothing more is left after Galt's explanation.

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Senior Manager
Joined: 04 Jun 2007
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05 Jun 2007, 10:01
sorry, but where is the attachment, how do i access it?

new here.

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Manager
Joined: 14 Mar 2007
Posts: 235

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05 Jun 2007, 14:21
Very nice, it ois a question of sets+probability and DS!!! Galt rocked this one

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05 Jun 2007, 14:21
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