bob has to study for four final exams: accounting (a), biology (b), communications (c), and drama (d). (a) if he studies one subject at a time, in how many different ways could he arrange them?
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bob has to study for four final exams: accounting (a), biology (b), communications (c), and drama (d). (a) if he studies one subject at a time, in how many different ways could he arrange them?
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