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I have 5 different biology textbooks and 4 different economics textbooks. In how many ways can I place the 9 textbooks on a bookshelf, in a row, if there must be an economics textbook in the middle, and there must be a biology textbook at each end?

 Apr 19, 2020
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There are 5!*3!*2 = 1440 ways of arranging the textbooks.

 Apr 19, 2020

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