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Suppose, you are attending an exam where there are 9 multiple choice questions with 3 options in each. A question can have multiple correct answers,

Suppose, you are attending an exam where there are 9 multiple choice questions with 3

options in each. A question can have multiple correct answers, and in that case, you

have to check all of the correct answers to get the question right.

a. What is the probability that you'll get exactly 6 of the questions right?

b. What is the probability that you'll get at most 6 of the questions right?

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