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a teacher in constructing a mathematics test consisting of 10 questions. She has a pool of 28 questions, which are classified by level of difficulty

a teacher in constructing a mathematics test consisting of 10 questions. She has a pool of 28 questions, which are classified by level of difficulty as follows: 6 difficult questions, 10 average questions, and 12 each questions. How many different 10 question test can she construct from the pool of 28 questions if her test is to have 3 difficult, 4 average, and 3 easy questions?

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