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4) There are 7 students taking a review class for a standardized exam. One night they take a practice exam and the next day the

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4) There are 7 students taking a review class for a standardized exam. One night they take a practice exam and the next day the instructor posts a list of students' names that passed, in order from the highest score to the lowest score. (Students that did not pass are not listed and no students got the same score.) a) How many different lists are possible? b) What if there were n students in the review class

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