What is the probability that exactly 10 questions

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Sam Has not prepared for the upcoming exam. Exam is completely based on multiple choice questions with 5 options for each and only one correct answer. There are 20 questions in the exam and Jack attempted all questions betting on his luck.

a. What is the probability that exactly 10 questions are correct?

b. What is the probability that at least 3 questions are wrong?

c. What is the probability that at most 5 questions are correct?

Reference no: EM132412500

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