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Old 07-28-2007   #3
Mr. me
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The probability of a wrong answer is the number wrong over the total number of possible answers. Since, for each question, only one answer is correct, the probability of a wrong answer is 4/5, and the probability of a correct answer is 1/5Hence p(wwc) = 4/5 * 4/5 * 1/5 = 16/125 (or .128)