Three students (S) and six faculty members (F) are on a panel discussing a newcollege policy.(a) In how many different ways can the nine participants be lined up at a table in thefront of the auditorium?(b) How many lineups are possible, considering only the labels S and F?(c) For each of the nine participants, you are to decide whether the participant did agood job or a poor job stating his or her opinion of the new policy; that is, give each of thenine participants a grade of G or P. How many different ”scorecards” are possible?
Question
Three students (S) and six faculty members (F) are on a panel discussing a newcollege policy.(a) In how many different ways can the nine participants be lined up at a table in thefront of the auditorium?(b) How many lineups are possible, considering only the labels S and F?(c) For each of the nine participants, you are to decide whether the participant did agood job or a poor job stating his or her opinion of the new policy; that is, give each of thenine participants a grade of G or P. How many different ”scorecards” are possible?
Solution
Sure, here are the answers:
(a) The nine participants can be lined up in 9! (9 factorial) ways. This is because the first position can be filled by any of the 9 participants, the second position can be filled by any of the remaining 8 participants, and so on, until the last position can be filled by the remaining 1 participant. So, 9! = 987654321 = 362,880 ways.
(b) Considering only the labels S and F, we have 3 students and 6 faculty members. The number of ways to arrange these 9 people is given by the multinomial coefficient (9 choose 3,6) = 9! / (3! * 6!) = 84 ways.
(c) For each of the nine participants, there are 2 possibilities (G or P). So, for all nine participants, there are 2^9 = 512 different "scorecards" possible.
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