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Discrete structures: An exam has 25 True/False questions. How many unique ways may a student complete the exam if they may leave any given question

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Discrete structures:

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An exam has 25 True/False questions. How many unique ways may a student complete the exam if they may leave any given question blank? An exam consists of 10 True/False questions each worth exactly the same number of points. Assume 123 students take this exam. How many students are guaranteed to have earned the same grade

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