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# A certain junior class has 1000 students and a certain

Author Message
Manager
Joined: 17 Jan 2006
Posts: 92

Kudos [?]: 18 [0], given: 0

A certain junior class has 1000 students and a certain [#permalink]

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07 May 2006, 18:04
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

Kudos [?]: 18 [0], given: 0

VP
Joined: 29 Dec 2005
Posts: 1338

Kudos [?]: 69 [0], given: 0

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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

Kudos [?]: 69 [0], given: 0

Re: probability   [#permalink] 07 May 2006, 20:04
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