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A certain junior class has 1000 students and a certain

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A certain junior class has 1000 students and a certain [#permalink] New post 07 May 2006, 18:04
A certain junior class has 1000 students and a certain senior
class has 800 students. Among these students, there are 60 sibling
pairs, each consisting of 1 junior and 1 senior. If 1 student is to be selected
at random from each class, what is the probabilty that the 2 students selected
will be a sibling pair

3/40,000
1/3,600
9/2,000
1/60
1/15
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Re: probability [#permalink] New post 07 May 2006, 20:04
i guess it was discussed recently................

= 60/1000(1/800) = 3/40,000


i find it: http://www.gmatclub.com/phpbb/viewtopic ... ht=sibling
Re: probability   [#permalink] 07 May 2006, 20:04
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