A class consists of 6 undergraduate students and 4 graduate students. An exa is given and the students are ranked according to their performance. Assume that no two students obtained the same score. a. How many different possible rankings are there? b. If all ranking are considered equally likely, what is the probability that graduate students receive the top four scores?

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Chapter8: Sequences, Series,and Probability
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A class consists of 6 undergraduate students and 4 graduate students. An exa is given and the students are ranked according to their performance. Assume that no two students obtained the same score.

a. How many different possible rankings are there?

b. If all ranking are considered equally likely, what is the probability that graduate students receive the top four scores?

 
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