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There are 20 books on Algebra and Calcul...

There are 20 books on Algebra and Calculus in one library. For the greatest number of selections each of which consists of 5 books on each topic. If the possible number of Algebra books are N, then the value N/2 is __________.

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The correct Answer is:
12!;`(11! 4!)/((3!)^(4)2!)`
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