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if a class has 28 students in how many different arrangements can 5 students
give their individual presentations to the class ?
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In 28*27*26*25*24 = 11793600 different arrangements (assuming that the order of students matters). ANSWER
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Learn English from my post.
Also learn to formulate correctly the problems descriptions placing right words in the right order.
Or consider to hire somebody, who will edit your texts after you . . .