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Answer: Total no. of students = 9 Total no. of students checked for ID = 5 Students without legal age = 4 No. of students that are refused for serving alcohol = 2 The no. of ways in which 5 students can be checked for their Id out of 9 students = ([9],[5]) The no. of ways in which 2 students without legal age are checked out of 4 students without legal age while the oth ... See the full answer