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

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My apologies (again) if this is a re-post: It's a [#permalink] New post 04 Jun 2007, 11:13
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
My apologies (again) if this is a re-post:
It's a probability question, please refer to the attachment,
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PS - Probability.JPG
PS - Probability.JPG [ 34.68 KiB | Viewed 298 times ]

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 [#permalink] New post 04 Jun 2007, 11:23
harddddddddddd!!!! :shock:
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 [#permalink] New post 04 Jun 2007, 14:54
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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 [#permalink] New post 04 Jun 2007, 14:58
Bravo :-D
E it is!!!
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 [#permalink] New post 05 Jun 2007, 06:45
E for me too.
Nothing more is left after Galt's explanation.
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 [#permalink] New post 05 Jun 2007, 09:01
sorry, but where is the attachment, how do i access it?

new here. :)
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 [#permalink] New post 05 Jun 2007, 13:21
Very nice, it ois a question of sets+probability and DS!!! Galt rocked this one :twisted: :twisted: :twisted:
  [#permalink] 05 Jun 2007, 13:21
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My apologies (again) if this is a re-post: It's a

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