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Mathematics 12 Online
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

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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