Question: An exam will be presented to a multiple choice exam with 20 questions. The situation is as follows: With probability 0.25 there will be 2

An exam will be presented to a multiple choice exam with 20 questions. The situation is as follows: With probability 0.25 there will be 2 answer opportunities per question and with probability 0.75 there will be 4 answer possibilities. At least 15 correct answers are required to pass.

What is the probability that the exam will be approved if - regardless of the number of answers - the answer to 10 questions and can choose answers randomly to the other 10?

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