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# Each of the 25 balls in a certain box is either red, blue,

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Manager
Joined: 24 Oct 2005
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Each of the 25 balls in a certain box is either red, blue, [#permalink]

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26 Sep 2006, 19:09
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Each of the 25 balls in a certain box is either red, blue, or white and has a number from 1 to 10 painted on it. If one ball is to be selected at random from the box, what is the probability that the ball selected will either be white or have an even number painted on it?

(1) The probability that the ball will both be white and have an even number painted on it is 0.
(2) The probability that the ball will be white minus the probability that the ball will have an even number painted on it is 0.2.
Manager
Joined: 25 Sep 2006
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26 Sep 2006, 22:44
E ?Seems unsolvable to me.
QUestion asks for P(White + Even) = ?

I) Tell us that WHITE and EVEN are mutually exclusive, but still, the
prob(White OR Even) cannot be implied from here.
P(White x Even) = 0

II) P(White) - P(even) = 0.2
An equation is given, but still we can't get P(White + Even) from here.

Both information together are still not sufficient. OA ?
Senior Manager
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27 Sep 2006, 04:00

P(w) + P(e) - P(w and e)

We cannot get this from given equations.

Should be E
Manager
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27 Sep 2006, 08:16
OA is E. Well done
Manager
Joined: 14 Sep 2006
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27 Sep 2006, 09:06
This one is hard and I don't know the answer - but would guess E. Don't you love my value-added posts???
27 Sep 2006, 09:06
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