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May 22, 2015

Homework Help: Probability

Posted by John on Saturday, January 5, 2013 at 10:27pm.

Mary took a 20 question multiple-choice exam where there are 4 choices for each question and only 1 of those choices is correct. Rather than reading the question, Mary simply puts a random choice of answer down for each question. Determine the probability that Mary gets exactly 8 of the 20 questions correct.

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