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by chuddy09
Sat Jan 02, 2010 1:20 pm
 
Forum: Manhattan Prep GMAT CAT Math
Topic: Probability
Replies: 9
Views: 4650
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Re: Probability

I am using C! to solve this issue

There are 6 N, 5 P and 4 D. In order to not select nickle twice in a row, we would only be selecting P and D -without replacement. Hence the formula should be

(5c1/9c1)X (4c1x8c1)

This gives me an answer of 5/18. What am I doing wrong? Plz advice.