There are 20 books on Algebra and Calculus in one library. For the greatest number of selections each of which consists of 5 books on each topic. If the possible number of Algebra books are N, then the value N/2 is __________.

There are 20 books on Algebra and Calculus in one library. For the greatest number of selections each of which consists of 5 books on each topic. If the possible number of Algebra books are N, then the value of N/2 is __________.

There are 12 books on Algebra and Calculus in our library,the books of the same subject beingdifferent.If the number of selections each of which consists of 3books on each topic is greatest thenthe number of books of Algebra and Calculus in the library are respectively:

There are n different books and p copies of each in a library. Find the number of ways in which one or more than one books can be selected.

In a library, there are 10 different sections and the librarian categorises the books over 20 days. Which section has the least number of books?

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

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

There are n books having p copies of each . The number of ways in which a selection can be made from them is :

There are 3 books of mathematics, 4 of science, and 5 of literature. How many different collections can be made such that each collection consists of one book of each subject.