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February 24th, 2018, 12:51 AM  #1 
Newbie Joined: Feb 2018 From: Viet Nam Posts: 2 Thanks: 0  Probability
In class 12A, 9 students (5 boys and 4 girls) are admitted to a school. School students are randomly divided into 4 classes (each class has more than 9 students). Calculate the probability that in the 4 classes there is one class with 3 male, 2 female class 12A

February 24th, 2018, 12:56 AM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,202 Thanks: 1156 
I can't understand this as written.

February 24th, 2018, 04:56 AM  #3 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,261 Thanks: 894  You just said "each class has more than 9 students". There cannot be a class with only 5 students.

February 24th, 2018, 05:28 AM  #4 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,608 Thanks: 954 
Unless meaning is: what is probability that 3 boys and 2 girls from the 9 admitted students are in same class? 
February 24th, 2018, 10:50 AM  #5 
Senior Member Joined: Sep 2015 From: USA Posts: 2,202 Thanks: 1156  

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