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

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Manager
Joined: 21 Dec 2005
Posts: 103
Followers: 1

Kudos [?]: 1 [0], given: 0

Each of the 25 balls in a certain box are either red, blue [#permalink]  07 Apr 2006, 19:32
Each of the 25 balls in a certain box are either red, blue or white and has a number painted on it from 1 to 10. If one ball is to be selected at random from the box what is the probability that the ball selected will be either white or have an even number painted on it?

1. The probability that the ball will be both 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
SVP
Joined: 14 Dec 2004
Posts: 1706
Followers: 1

Kudos [?]: 59 [0], given: 0

We need P(W+E) = P(W) + P(E) - P(W.E)

St1: P(W.E) = 0
Insufficient

St2: P(W) - P(E) = 0.2
Insufficient

Together, we can express P(W) in terms on P(E) & P(W.E) = 0, but still can't determine the value.

So "E"
Manager
Joined: 27 Mar 2006
Posts: 136
Followers: 1

Kudos [?]: 1 [0], given: 0

1) Does not tell you the probability of white balls and probability of even numbers occuring
2) Still need to know number of white balls or number of even numbers

So E
Senior Manager
Joined: 22 Nov 2005
Posts: 478
Followers: 2

Kudos [?]: 3 [0], given: 0

We need number for the white ball.

But from both statement we can't get it.

SO E
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# Each of the 25 balls in a certain box are either red, blue

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