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A math teacher is preparing a quiz for all of the students in grade 12. She wants to give each student the same questions, but

A math teacher is preparing a quiz for all of the students in grade 12. She wants to give each student the same questions, but have each student's questions appear in different order. If there are 128 students in the grade 12 class, what is the least number of questions the quiz must contain so everyone gets a test with the questions in a different order

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