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To take quizzes, each of 30 students in a class is paired with another student. If the pairing is done randomly, what is the probability that Margo is paired with her best friend, Irma, and that George is paired with his best friend Fred? Express your answer as a common fraction.

 Dec 15, 2020
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I think you would have this many pairs: 30 nCr 2 = 435 pairs,  and only 2 of them will get the 4 best friends paired together. So, the probability is: 2 / 435

 Dec 15, 2020

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