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In a certain class, there are 30 students.  The teacher chooses four students at random to complete a project.  What is the probability that the top 3 students in the class are among the chosen students?

 Dec 10, 2020
 #1
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P (top 3 students are chosen)  =  

 

1  - P ( none of the  top  three are chosen )  =

 

             C(27,4)

1 -        ________   =       

              C(30,4)

 

         130

1 -    ____  =        [ 203 - 130 ] / 203   =     73/203

         203

 

 

cool cool cool

 Dec 10, 2020

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