How many ways can Ismail arrange four different textbooks on the shelf in his locker?

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How many ways can Ismail arrange four different textbooks on the shelf in his locker?

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Answer 1 · 2016-10-23T13:16:57

$4! = 24$ $4! =24$

Explanation:

There are $4$ $4$ different choices for the first book, but once that one is in place, there are $3$ $3$ choices for the second, two for the third and then only 1 book remains to be placed on the shelf last.
This assumes that the books are all different.

The number of possible arrangements is $4 \times 3 \times 2 \times 1 = 24$ $4xx3xx2xx1 = 24$

This is called '4 factorial' and has the symbol $4!$ $4!$

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How many ways can Ismail arrange four different textbooks on the shelf in his locker?

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