The number of ways of selecting 8 books from a library which has 9 books each of Mathematics, Physics, Chemistry and English is:

Find the number of ways of selecting 5 books from 9 different mathematics books such that a particular book is not included.

The sum of the costs of one book each of Mathematics, Physics and Chemistry is Rs 210. Total cost of a mathematics book, 2 physics books, and a chemistry book is Rs. 240/- Also the total cost of a Mathematics book, 3 physics book and 2 chemistry books is Rs. 300/-. Find the cost of each book using matrices.

The number of ways in which 5 mathematics , 4 physics , 2 chemistry books can be arranged in a shelf so that the books of mathematics books are kept together is

The number of ways of distributing 3 identical physics books and 3 identical mathematics books among three students such that each student gets at least one books is

The number of ways of distributing 3 identical physics books and 3 identical mathematics books among three students such that each student gets at least one books is

The number of ways of distributing six identical mathematics books and six identical physics books among three students such that each student gets atleast one mathematics book and atleast one physics book is (5.5!)/(k) , then k is..