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Four Books, One Each in Chemistry, Physics, Biology and Mathematics, Are to Be Arranged in a Shelf. in How Many Ways Can this Be Done? - Mathematics

Four books, one each in Chemistry, Physics, Biology and Mathematics, are to be arranged in a shelf. In how many ways can this be done?

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Solution

Here, all the four books are to be arranged on a shelf. This means that we have to find the number of arrangements of the books, taken all at a time.
⇒ 4P4
Now, nPn = n!
Similarly, 4P4  = 4! = 24

Concept: Factorial N (N!) Permutations and Combinations
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APPEARS IN

RD Sharma Class 11 Mathematics Textbook
Chapter 16 Permutations
Exercise 16.3 | Q 18 | Page 28
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