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You would have 7 lines with 8 students in each line. Also have 2 lines with 28 students, or 4 lines with 14 students.
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-- The first place can be any one of 20 students. For each of these, -- the second place can be any one of the remaining 19 students. For each of these, -- the third place can be any one of the remaining 18 students. For each of these, -- the fourth place can be any one of the remaining 17 students. So the four places can be assigned in any one of (20 x 19 x 18 x 17) = 116,280 ways.
Either 5 rows of 7 students - or - 7 rows of 5 students. --------------------------------------------------------- or 1 row of 35 students or 35 rows of 1 student (like in an exam hall)