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ddd [48]
3 years ago
8

From eight different books, in how many ways can any four of them be arranged side by side on a book shelf?

English
1 answer:
bezimeni [28]3 years ago
8 0
<span>First let us see how many ways we can arrange four books. This can be done using a permutation: 4! = 4 x 3 x 2 x 1 = 24 ways Now we have to arrange them amongst the other 4 books, but lets consider them as package of 1. This will mean there are 5! ways to arrange the other 4 books. Combining the calculations gives us: 5! x 4! = 2880 different ways.</span>
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