There are several books on a bookshelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?
9 books wil b on the shelf
How many ways can n books be placed on k distinguishable shelves? a. If no two books are the same ,and the positions of the books on the shelves does not matter? b. If no two books are the same,and the positions of the books on the shelves matter?
My first is the base of a rose prominently displayed on a shelf, My second is a small space from which you cannot exit by yourself, My whole is a biological unit and restorer of health. What am I?
