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2016-04-06T17:51:42+05:30

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You can put 4 books in

4!
= (4)(3)(2)(1)
= 24 different ways

(It is called Four factorial)
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2016-04-06T17:53:09+05:30

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For this, we have a new concept. Its factorial.
n ! = (n -1) (n-2) (n-3)...(1)

Here, the books can be arranged in 4! Ways i.e. 4×3×2×1 = 24 different ways.
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