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DS: Probablity RWB balls

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swapna
 Post subject: DS: Probablity RWB balls
 Post Posted: Sun Aug 07, 2011 7:18 am 
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Course Students


Posts: 9
Each of the 25 balls in a certain box is either red, blue or white and has a number from 1-10 painted on it. If one ball is selected at random what is the probablity that the ball selected will either be white or have an even number painted on it?

a) The probablity that the ball will both be white and have an even number is 0.

b) The probablity that the ball will both be white minus the probablity that the ball will have an even number on it is 0.2.
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RonPurewal
 Post subject: Re: DS: Probablity RWB balls
 Post Posted: Mon Aug 08, 2011 1:26 am 
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ManhattanGMAT Staff


Posts: 7146
please search the forum for existing threads before you post; this is a particularly easy problem to find. thank you.

each-of-the-25-balls-in-a-certain-box-is-either-red-blue-or-t308.html
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