In how many ways 3 Mathematics books, 4 History books, 3 Chemistry books and 2 Biology books can be arranged on a shelf so that all books on the same subject are together.

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 ?

In how many ways can a team of 3 boys and 3 girls be selected from 5 boys and 4 girls?

There are 6 books on mathematics, 4 books on physics annd 5 books on chemistry in a book shop. The number of ways can a student purchase either a book on mathematics or a book on chemistry, is

In how many ways 12 different books can be distributed equally among 3 persons?

In how many ways can the letters of the word ASSASSINATION be arranged so that all the S’s are together ?

How many selections of 4 books can be made from 8 different-books ?

In how many ways can 5 different books be tied up in three bundles?

In how many ways can 4 boys and 3 girls be seated in a row so that no two girls are together ?