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Probability
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OpenStudy (anonymous):
medal awarded A student is to answer 10 out of 13 questions on an exam . (A) How many choices has he ? (B) How many if he has to answer the first two questions. (c) How many if must answer the first or second question but not both ? (d) How many if he must answer exactly three out of the first five questions ? (e) How many if he must answer at least three of the first five questions ?
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