1.

There are 10 books in a shelf with different titles:five or these have red cover and others have green cover. In how many ways can these be arranged so that the red books are placed together ?

Answer»

Solution :There are 10 books in a SHELF with different titles, 5 of these are red COVERS and others are green covers considering 5 red COVERED books as one book, we have all TOTAL 6 books as one book, we have all total 6 books which can be arranged in "6!" ways. The FIVE red cover books arranged among themselves in 5! ways.
`:.` The total number of arrangements `=5!xx6!`


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