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(Solution) - A professor writes 20 multiple choice questions each with the possible

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A professor writes 20 multiple-choice questions, each with the possible answer a, b, c, or d, for a discrete mathematics test. If the number of questions with a, b, c, and d as their answer is 8, 3, 4, and 5, respectively, how many different answer keys are possible, if the questions can be placed in any order?

 







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This question was answered on: Jul 11, 2017

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