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A certain junior class has 1,000 students and a certain

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Re: A certain junior class has 1,000 students and a certain [#permalink] New post 05 Oct 2012, 07:58
Can anyone clear my doubt i a m struggling
TOtal number of outcome = 1000*800
Sibbling with Juniors = 60
so 60 out of 1000

Sibling with Senior = 60
so 60 out of 800
we have to find probability of 2 sibbling 1 from each
60 C 1= Selection from Senior
60 C 1 = From Junior
total fav = 1000*800
Prob ={ 60 C 1 *60 C 1}/1000*800
=9/2000

pls tell me where i am wrong in my approach and what correction needed
Re: A certain junior class has 1,000 students and a certain   [#permalink] 05 Oct 2012, 07:58
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