A multiple choice exam consists of 10 questions, each having 5 possible answers. To pass, you must answer at least 6 out of 10 questions correctly. What is the probability of You go into the exam without knowing a thing, and have to resort to pure guessing, you have studied enough so that on each question, 3 choices can be eliminated. But then you have to make a pure guess between the remaining 2 choices?
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