There are `p` copies each of `n` different books. Find the number of ways in which a nonempty selection can be made from them.

A shopkeeper has 11 copies each of nine different books, then the number of ways in which atleast one book can be selected is

There are m copies each ofn different books in a university library.The number of ways in which one or more than one book can be selected is

A shopkeeper has 10 copies of each of nine different books,then number of ways in which at least one book can be selected is

A shopkeeper has 10 copies of each of nine different books, then number of ways in which atleast one book can be selected is

The number of ways in which four letters can be selected from the word degree, is

There are three copies each of 4 different books.In how many ways can they be arranged in a shelf?

There are 10 different books in a shelf. The number of ways in which three books can be selected so that exactly two of them are consecutive is