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There are a total of 48 students in grade 10 charity.Twenty are boys and 28 are girls.S uppose that a team of 3 students is formed such that it is composed of a team leader,a secretary,and a spokesperson.What is the probability that a team formed is composed of a girl secretary?

 Feb 5, 2020

Best Answer 

 #1
avatar+6 
+2

Here is my solution, hope it can help :)

(28*47*46)/(48*47*46) = 7/12.

 Feb 5, 2020
 #1
avatar+6 
+2
Best Answer

Here is my solution, hope it can help :)

(28*47*46)/(48*47*46) = 7/12.

nguyenquan263 Feb 5, 2020
 #2
avatar+6 
+2

The idea is, choose the secretary first, which has 28 options. After that, we choose the other 2 positions by selecting the rest of people without any condition :)

 Feb 5, 2020
 #3
avatar+107011 
0

Thanks,  Nguyen.....that's  a good explanation   !!!!!

 

 

cool cool cool

 Feb 5, 2020

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