3 years ago

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

2 answers:

6 0

9 different ways....why is tom buying 7 books if he only has room for 3?

4 0

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

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Ksivusya [100]

Answer:

x≈13.08

Step-by-step explanation:

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$a^{2} +b^2=c^2\\a=5\\b=x\\c=14\\5^2+x^2=14^2\\x^2=196-25\\x^2=171\\x=3\sqrt{19} =13.08$

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