places on at will the bookshelf 10 books, asks 5 books which in which assigns to put on the same place probability
I think it's Yoda, the Jedi Master . . .
I'll take a wild guess . . .places on at will the bookshelf 10 books,
asks 5 books which in which assigns to put on the same place probability
Ten distinct books are placed randomly on a shelf (in a row).
What is the probability that a particular five books are adjacent?
There are possible arrangements.
Duct-tape those five books together.
Then we have six "books" to arrange: .
. . They can be arranged in ways.
For each of these, the five books can be permuted in ways.
. . Hence, there are: . desirable arrangements.
The probability is: .