Question: There are twenty multiple-choice question on exam, each having responses a, b, c, d. Suppose that a student has a 90% chance to answer each

There are twenty multiple-choice question on exam, each having responses a, b, c, d. Suppose that a student has a 90% chance to answer each question correctly, and all the answers are independent. If the student needs to answer at least 18 questions to get an A, what is the probability that the student will get an A

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