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In a multiple choice exam, there are 6 questions and 4 choices for each question (a,...

In a multiple choice exam, there are 6 questions and 4 choices for each question (a, b, c, d). Nancy has not studied for the exam at all and decides to randomly guess the answers. What is the probability that: (a) the first question she gets right is the 4th question? (b) she gets all of the questions right? (c) she gets at least two question right?

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