5 Engineering , 4 Mathematics and 2 Chemistry books are placed on a shelf at random. The probability that the books of each kind are all together is

5different Engineering,4 different Mathematics and2different Chemistry books are placed in a shelf at random.The probability that the books of each kind are all together is

Eleven books, consisting of five Engineering books, four Mathematics books and two Physics books, are arranged in a shelf at random. What is the probability that the books of each kind are all together?

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

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

Five books on english and three books on mathematics are placed at random on a bookshelf . Find the probability that the books on mathematics are placed side by side.

The number of ways in which 4 books on Mathematics and 3 books on English can be placed in a shelf, so that the books on the same subject always remain together is

Three volumes of book and five volumes of another book are placed at random on a book shelf. Find the probability that all volumes of both the books will be found together.

The number of ways that 5 Mathematics,3 Physics and 2 Chemistry books can be arranged so that the three physics books kept together and the two chemistry books not together is