The number of ways in which 10 books can be arranged in a row such that two specified books are side by side is

The number of ways in which n books can be arranged on a shelf so that two particular books are not together is

The number of ways in which n books can be arranged so that two particular books are not together is

The number of ways in which n books can be arranged so that two particular books are not together is

The number of ways in which 7 people can sit in a round table so that two specified people sit side by side is

Find the number of ways in which 5 different books can be arranged on a shelf.

Show that the number of ways in which n books may be arranged on a shelf so that two particular books shall not be together is (n-2)(n-1)!

Show that the number of ways in which n books may be arranged on a shelf so that two particular books shall not be together is (n-2)(n-1)!

Number of ways in which 15 different books can be arraged on a shelf so that two particular books shall not be together is

Number of ways in which 15 different books can be arraged on a shelf so that two particular books shall not be together is