How is question 4 computed?

Question 4 In a. multiple choice exam, there are 5 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) (2 points) the rst question she gets right is the 5 th question? (1)] (2 points) she gets all of the questions right? (c) (2 points) she gets at least one question right? n____.2___