live4dramaoy0yf9 live4dramaoy0yf9

11-05-2018
Mathematics

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Tom bought 7 books. He has space only for 3 books in his bookshelf. In how many ways can he arrange the 3 books?

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icedipping icedipping

11-05-2018

That's 7P3, or 7!/4!, or 210.

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