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In a multiple choice exam, there are 4 questions and 4 choices for each question (a, b, c, d). Nancy has not studied for the

In a multiple choice exam, there are 4 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 question number 3?

b) she gets all of the questions right?

c) she gets at least one question right?

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