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A teacher composes 12 question quizzes using a bank of 15 questions of one type, 20...

A teacher composes 12 question quizzes using a bank of 15 questions of one type, 20 questions of a second type, and 10 questions of a third type....

The teacher wants the quiz to have exactly 4 type of each question... how may different quizzes could be produced?

Note: the order of which the questions appear do not matter)

math   Statistics-And-Probability   
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