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, ⁿP_n = n!
Similarly, ⁴P₄= 4! = 24

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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?

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

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, ⁿP_n = n!
Similarly, ⁴P₄= 4! = 24