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# A certain junior class has 1000 students and a certain

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Joined: 17 Jan 2006
Posts: 92
Followers: 1

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

A certain junior class has 1000 students and a certain [#permalink]  07 May 2006, 17:04
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
VP
Joined: 29 Dec 2005
Posts: 1349
Followers: 7

Kudos [?]: 30 [0], given: 0

Re: probability [#permalink]  07 May 2006, 19:04
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, 19:04
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