A multiple choice test has 6 questions and each question has 4 choices. In how many ways could a student get exactly one of the questions wrong? Assume he answers all the questions.

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The student has 24 different possible answers. Of those answers 6 are correct. 24-6=18. There are 18 wrong answers, and therefore 18 opportunities to answer any one of the questions wrong.

the student could get one of the questions wrong 18 differnt ways

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