n how many ways can you place 9 different books on a shelf if there is space enough only 5 books? ution: Pn,r=frac n!m-r! Answer: There are 15120 ways that 9 different books can bi P9,5=frac 919-5! placed on a shelf with space enough for only 5 book =frac 987654522221 P9,5=15 120
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