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by lillysonglove
Sat Jul 13, 2013 6:07 pm
 
Forum: GMAT Official Practice Test Math
Topic: * probabilty 1-x trick by Lilly
Replies: 2
Views: 976
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* probabilty 1-x trick by Lilly

Please tell me why only A is correct and not B in the following questions. There are 5 white balls and 3 black balls in a urn. two balls are drawn at random what is the probability that both the balls are not black? a 1-(3C2/8C2) b 5C2/(8C2) As if they are not black, they are white in this case, I g...