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Alex has four books of different sizes which he wishes to place on a bookshelf. Unfortunately, the bookshelf has a conspicuous hole at one end through which only the smallest book can fall. If he wishes for all his books to stay stationary, in how many ways can he arrange his books?

 Apr 30, 2019

The smallest book can fit in any of three positions....and all tthe rest can fit in 3! ways.....




3 * 3!  =     3 * 6   =   18 ways


cool cool cool

 Apr 30, 2019

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