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OpenStudy (anonymous):
The Book of the Month club offers a choice of 3 books from a selection of 40 books. How many different selections can members order? 12 9880 1480 3000
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OpenStudy (lgbasallote):
there are 40 books...you can pick 3 so use the formula \[\huge \frac{n!}{r!(n-r)!}\] therefore you'll get \[\huge \frac{40!}{3!(40-3)!}\] got it @BuffaloBill ?
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