There are four different versions of Chinese books and six different versions of math books on the bookshelf. What is the probability that the specified three books will be put together?

*** 10 book, then the total release method is: 10!

Specify three books together, and then tie them together in order, there are three books! It is equivalent to 8 elements after binding. If you arrange all 8 elements, you get 8! . So specify three books to put together, and the result is 3! 8!

So the probability is p = 3! 8! / 10! =6/90= 1/ 15

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