Question 1115598: Mr. Marshall has nine different history books. how many ways can she arrange eight of them on a shelf.
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! 9 ways to choose the first*8 ways to choose the second*7 ways to choose the third*6 ways to choose the fourth.
9*8*7*6*5*4*3*2, which is the same answer as 9!, since once the 8 are chosen, the ninth is fixed: 362,880
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